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meson: fix getrandom detection for uclibc

Fabrice Fontaine requested to merge (removed):master into master

The getrandom() detection from meson.build fails with the following error message:

.../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:27:35: error: unknown type name 'size_t'
    27 | extern int getrandom(void *__buf, size_t count, unsigned int flags)
       |                                   ^~~~~~
 .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:8:1: note: 'size_t' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?

Fix it by adding stddef.h include to the meson getrandom() detection.

Fixes:

../src/pipewire/impl-core.c:54:9: error: conflicting types for ‘getrandom’
     54 | ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
        |         ^~~~~~~~~
  In file included from ../src/pipewire/impl-core.c:34:
  .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:27:12: note: previous declaration of ‘getrandom’ was here
     27 | extern int getrandom(void *__buf, size_t count, unsigned int flags)
        |            ^~~~~~~~~

[Retrieved from: https://git.buildroot.net/buildroot/tree/package/pipewire/0001-meson-fix-getrandom-detection-for-uclibc.patch]

Edited by Fabrice Fontaine

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