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Build: Use POSIX.1–2001 (IEEE Std 1003.1-2001)

Define `_POSIX_C_SOURCE` to `200112L`, to indicate we want to use
POSIX.1–2001. Additionally remove incorrect definition of
`POSIX_C_SOURCE` (note the lack of underscore at the beginning).
The intention was probably to define `_POSIX_C_SOURCE` which would be
redundant and previously even conflicting with the other version set
previously.
For the has_function check, use the correct value of `200112L`.

--- a/meson.build

+++ b/meson.build

@@ -56,7 +56,7 @@

 feature_defines = [

     ['_GNU_SOURCE',                 1], # Enable GNU extensions on systems that have them

-    ['_POSIX_C_SOURCE',             '200809L'], #IEEE Std 1003.1

+    ['_POSIX_C_SOURCE',             '200112L'], # POSIX.1–2001 (IEEE Std 1003.1-2001)

 ]

 if host_machine.system() == 'windows'

@@ -100,8 +100,7 @@

     warning('Compiler does not support -fvisibility=hidden, all symbols will be public!')

 endif

-if cc.has_function('posix_memalign', prefix: '#include <stdlib.h>', args: ['-D_POSIX_C_SOURCE=200112'])

-    feature_defines += [['POSIX_C_SOURCE', 200112]]

+if cc.has_function('posix_memalign', prefix: '#include <stdlib.h>', args: ['-D_POSIX_C_SOURCE=200112L'])

     cdata.set('HAVE_POSIX_MEMALIGN', 1)

 elif cc.has_function('_aligned_malloc', prefix: '#include <malloc.h>')

     cdata.set('HAVE_ALIGNED_MALLOC', 1)