Add x86_64 module to uclibc/mod.rs

Add experimental L4re support

This PR introduces a UNIX-alike target for the l4re microkernel
operating system. While this system is not a UNIX system at all, it is
easiest to use the POSIX interface and hence benefit from common
definitions.

This version is a very early draft, only the basic data types have been
verified and most of the complex data types (structs and unions) have
not been ported yet.

Thanks to TobiasSchaffner for providing his patched version, to verify some assumptions.

This commit introduces a UNIX-alike target for the l4re microkernel
operating system. While this system is not a UNIX system at all, it is
easiest to use the POSIX interface and hence benefit from common
definitions.

This version is a very early draft, only the basic data types have been
verified and most of the complex data types (structs and unions) have
not been ported yet.

Adding missing structs from linux/user.h

Adding structs from linux/user.h (or sys/user.h depending on OS version). This adds the linux user_regs_struct and user struct from sys/user.h into libc for x86 and x86_64. Also, bumping the version number.

As an aside, I was wondering if this was also the right place to add the bit offsets for the [EFLAGS register ](https://en.wikibooks.org/wiki/X86_Assembly/X86_Architecture#EFLAGS_Register)? These aren't defined anywhere in the linux system libraries instead the definition seems to just be in the x86 and x86_64 documentation but they are useful for anyone looking to interpret eflags. If libc is the right place for these constants I'd like the opportunity to add them before it's merged in. :)

Fixed the issues that prevented the libc_tests that are generated from passing. Also, fixed struct names and types to be representative of the linux source files.

Add _SC_NPROCESSORS_CONF on Linux

fill out common unix syscalls

i'm expecting a few build failures, particularly from brk/sbrk.

hopefully that fixes build errors

Fill in sys/sem.h as well as getitimer and setitimer

struct semun is not implemented and neither is semtimedop.

Added the sync() function from unistd.h

This fixes #601.

overflow lines caused style build failure

somehow i didn't catch this on my machine...oversight

_GNU_SOURCE works differently than other libraries and creates
function pointer issues

semget, semop, semctl; semtimedop not implemented and struct semun not defined

also struct itimerval, which is necessary for the implementation

Add gmtime()

Also slightly modified argument name for localtime.

Also slightly modified argument name for localtime.

Forgot to update cargo.lock before prior commit.

Fixed trailing whitespace in x86.rs and reverted the minor version number in the Cargo.toml