separate for gnu and msvc


scope resolve c_int

these types are not allowed, and more scope resolution


use size_t

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

Signed-off-by: Gerd Zellweger <mail@gerdzellweger.com>

This commit prepares the `libc` crate to be included directly into the
standard library via crates.io. More details about this can be found on
rust-lang/rust#56092, but the main idea is that this crate now depends
on core/compiler-builtins explicitly (but off-by-default).

The main caveat here is that this activates `no_core` when building as
part of libstd, which means that it needs to explicitly have an `iter`
and `option` module for the expansion of `for` loops to work.

Linux 4.18 added support for SIGSYS info in signalfd. Add the new
fields to signalfd_siginfo.

While the kernel has support for these new fields now, no libc has
shipped a release with the new signalfd fields.

There are none of them in `libc` except for `__progname` on Android, but
that one cannot be tested because it's not present in any header files.

Looks like Travis has moved on from our old images, so we're forced to
update.

The mmap(2) flag indicate that the mapping is used as a stack.

https://man.openbsd.org/mmap.2#MAP_STACK
https://marc.info/?l=openbsd-tech&m=152035796722258&w=2

Was able to move some of them up one level so they are valid on more
platforms with less duplication