Add pthread_atfork function

Solaris: Add ports support, correct some types, add some errnos

This should benefit Illumos too...

Add x86_64-linux-android support

When rust add support for x86_64-linux-android, the tests may be run with:
`rustup target add x86_64-linux-android && bash ci/run-docker.sh x86_64-linux-android`.

Android x86_64 emulator does not work without hardware acceleration, so we are not able to run tests on travis.

More constants

I searched through the codebases for libc and the various platforms to come to these conclusions.

These constants aren't available from the system headers so don't expose
them here.

Add const socket protocol for divert rule ipfw on FreeBSD

Link libc crate against pthread

pthread_* functions are defined in libpthread thus we need to link against
this library.

pthread_* functions are defined in libpthread thus we need to link against
this library.

Add IPC,SHM,MSG for Freebsd

              INFO for the patch:
FREEBSD [https://github.com/freebsd/freebsd]

        /sys/sys/_types.h
typedef    long        __key_t;

        /sys/sys/types.h
typedef    __key_t        key_t;

        /sys/sys/ipc.h
#define    IPC_CREAT    001000
#define    IPC_EXCL    002000
#define    IPC_NOWAIT    004000
#define    IPC_PRIVATE    (key_t)0
#define    IPC_RMID    0
#define    IPC_SET     1
#define    IPC_STAT    2
#define    IPC_INFO    3

#define    IPC_R        000400
#define    IPC_W        000200
#define    IPC_M        010000

struct ipc_perm {
    uid_t        cuid;
    gid_t        cgid;
    uid_t        uid;
    gid_t        gid;
    mode_t        mode;
    unsigned short    seq;
    key_t        key;
};

key_t    ftok(const char *, int);

        /sys/sys/msg.h
#define MSG_NOERROR    010000

typedef    unsigned long    msglen_t;
typedef    unsigned long    msgqnum_t;

struct msqid_ds {
	struct	ipc_perm msg_perm;
	struct	msg *msg_first;
	struct	msg *msg_last;
	msglen_t msg_cbytes;
	msgqnum_t msg_qnum;
	msglen_t msg_qbytes;
	pid_t	msg_lspid;
	pid_t	msg_lrpid;
	time_t	msg_stime;
	time_t	msg_rtime;
	time_t	msg_ctime;
};

struct msg {
	struct	msg *msg_next;
	long	msg_type;
	u_short	msg_ts;
	short	msg_spot;
	struct	label *label;
};

struct msginfo {
    int    msgmax,
        msgmni,
        msgmnb,
        msgtql,
        msgssz,
        msgseg;
};

int msgctl(int, int, struct msqid_ds *);
int msgget(key_t, int);
ssize_t msgrcv(int, void *, size_t, long, int);
int msgsnd(int, const void *, size_t, int);

        /sys/sys/shm.h
#define SHM_RDONLY  010000
#define SHM_RND     020000
#define SHMLBA      PAGE_SIZE
#define SHM_R       (IPC_R)
#define SHM_W       (IPC_W)
#define SHM_LOCK    11
#define SHM_UNLOCK  12
#define SHM_STAT    13
#define SHM_INFO    14

typedef unsigned int shmatt_t;

struct shmid_ds {
    struct ipc_perm shm_perm;
    size_t          shm_segsz;
    pid_t           shm_lpid;
    pid_t           shm_cpid;
    shmatt_t        shm_nattch;
    time_t          shm_atime;
    time_t          shm_dtime;
    time_t          shm_ctime;
};

void *shmat(int, const void *, int);
int shmget(key_t, size_t, int);
int shmctl(int, int, struct shmid_ds *);
int shmdt(const void *);

	/sys/security/mac/mac_internal.h
#define	MAC_MAX_SLOTS	4
struct label {
	int		l_flags;
	intptr_t	l_perpolicy[MAC_MAX_SLOTS];
};

              INFO for the patch:
FREEBSD [https://github.com/freebsd/freebsd]

        /sys/sys/_types.h
typedef    long        __key_t;

        /sys/sys/types.h
typedef    __key_t        key_t;

        /sys/sys/ipc.h

struct ipc_perm {
    uid_t        cuid;
    gid_t        cgid;
    uid_t        uid;
    gid_t        gid;
    mode_t        mode;
    unsigned short    seq;
    key_t        key;
};

key_t    ftok(const char *, int);

        /sys/sys/msg.h

typedef    unsigned long    msglen_t;
typedef    unsigned long    msgqnum_t;

struct msqid_ds {
	struct	ipc_perm msg_perm;
	struct	msg *msg_first;
	struct	msg *msg_last;
	msglen_t msg_cbytes;
	msgqnum_t msg_qnum;
	msglen_t msg_qbytes;
	pid_t	msg_lspid;
	pid_t	msg_lrpid;
	time_t	msg_stime;
	time_t	msg_rtime;
	time_t	msg_ctime;
};

struct msg {
	struct	msg *msg_next;
	long	msg_type;
	u_short	msg_ts;
	short	msg_spot;
	struct	label *label;
};

struct msginfo {
    int    msgmax,
        msgmni,
        msgmnb,
        msgtql,
        msgssz,
        msgseg;
};

int msgctl(int, int, struct msqid_ds *);
int msgget(key_t, int);
ssize_t msgrcv(int, void *, size_t, long, int);
int msgsnd(int, const void *, size_t, int);

        /sys/sys/shm.h

typedef unsigned int shmatt_t;

struct shmid_ds {
    struct ipc_perm shm_perm;
    size_t          shm_segsz;
    pid_t           shm_lpid;
    pid_t           shm_cpid;
    shmatt_t        shm_nattch;
    time_t          shm_atime;
    time_t          shm_dtime;
    time_t          shm_ctime;
};

void *shmat(int, const void *, int);
int shmget(key_t, size_t, int);
int shmctl(int, int, struct shmid_ds *);
int shmdt(const void *);

	/sys/security/mac/mac_internal.h
struct label {
	int		l_flags;
	intptr_t	l_perpolicy[MAC_MAX_SLOTS];
};

Update mod.rs

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Added O_EXEC, O_SEARCH to solaris and musl, O_PATH to musl.

See #566.

Make networking on Solaris/Illumos great again

Add fchown

add UTIME_OMIT, UTIME_NOW on linux

add truncate64/readdir64/openat64 on linux

add AT_* constants

Add FIONREAD for apple/b64

Adds the FIONREAD constant for macos/x86_64 machines.

add fdopendir