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Both recvmmsg/sendmmsg and statx require the `_GNU_SOURCE` symbol to be
defined to be shown in headers, but statx has the additional property of
being defined on all glibc systems[1], unlike recvmmsg which isn't
implemented on Hurd[2][3].
With this fix, all tests now pass on Hurd.
$ cat meson.build
project('test', 'c')
cc = meson.get_compiler('c')
cc.has_header_symbol('sys/stat.h', 'statx')
cc.has_header_symbol('sys/stat.h', 'statx', prefix: '#define _GNU_SOURCE')
cc.has_function('statx')
$ meson setup build
The Meson build system
Version: 1.5.1
Source dir: /tmp/tmp.XcWk4fMra4
Build dir: /tmp/tmp.XcWk4fMra4/build
Build type: native build
Project name: test
Project version: undefined
C compiler for the host machine: cc (gcc 14.2.0 "cc (Debian 14.2.0-3) 14.2.0")
C linker for the host machine: cc ld.bfd 2.43.1
Host machine cpu family: x86_64
Host machine cpu: x86_64
Header "sys/stat.h" has symbol "statx" : NO
Header "sys/stat.h" has symbol "statx" : YES
Checking for function "statx" : YES
Build targets in project: 0
[1]: https://sourceware.org/git/?p=glibc.git;a=blob;f=io/statx_generic.c;h=93faf12297cfcd37ba005a02e991eab351d74174;hb=HEAD
[2]: https://www.gnu.org/software/hurd/open_issues/glibc.html#recvmmsg
[3]: https://github.com/mesonbuild/meson/pull/4351
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