D6598: Declare _POSIX_SOURCE to ensure kill(2) is declared

[Michael Pyne]

mpyne created this revision.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  Believe it or not, but the `kill(2)` system call is not specified to be available by default in C.  It's part of BSD, POSIX, Single UNIX Spec, etc., but you do have to declare one of the various feature test macros for a strict libc (such as musl) to expose the declaration.
  
  The fix here was simply to define `_POSIX_SOURCE` before including the various C stdlib or UNIX headers.

TEST PLAN
  kinit now compiles with musl libc
  kinit still compiles with glibc on Linux

REPOSITORY
  R303 KInit

REVISION DETAIL
  https://phabricator.kde.org/D6598

AFFECTED FILES
  src/start_kdeinit/start_kdeinit.c

To: mpyne, #frameworks
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