D6631: Fix compilation with strict libc (such as musl)

[Michael Pyne]

mpyne created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Many of the functions we use implicitly are not part of the C standard
  library so we have to specific that we're pulling from POSIX, X/Open,
  BSD, or whatever standard we're using before we can rely on the
  definition being available.
  
        
  
  There's plenty of room for refactoring here since I mostly stopped at
  just getting the functions being called to show up from their includes,
  although I did replace rindex with strrchr since the latter is
  standardized, and replaced `uint` with `unsigned` rather than trying to figure out
  what header includes those.

TEST PLAN
  Now compiles against musl libc
  Still compiles against glibc.

REPOSITORY
  R111 KSysguard Library

REVISION DETAIL
  https://phabricator.kde.org/D6631

AFFECTED FILES
  ksysguardd/Command.c
  ksysguardd/Linux/ProcessList.c
  ksysguardd/Linux/diskstat.c
  ksysguardd/Linux/netstat.c
  ksysguardd/Linux/softraid.c
  ksysguardd/PWUIDCache.c
  ksysguardd/conf.c
  ksysguardd/ksysguardd.c

To: mpyne, #plasma, #frameworks
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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