meson.build: define WORDS_BIGENDIAN if need be

Drop the Apple-specific defines from config.h.meson - this was never true in
the meson build anyway as nothing set the AC_APPLE_UNIVERSAL_BUILD and the
else condition only undef'd WORDS_BIGENDIAN if... it was not defined.

Drop this and replace it with a meson endian check. There is only one source
file that checks for this #define in spa/plugins/alsa/acp/compat.h, let's hope
nothing breaks here.

config.h.meson

@@ -1,8 +1,5 @@
 /* config.h.  Generated by meson.  */
 
-/* Define if building universal (internal helper macro) */
-#mesondefine AC_APPLE_UNIVERSAL_BUILD
-
 /* poll doesn't work on devices */
 #mesondefine BROKEN_POLL
 
@@ -429,15 +426,7 @@
 
 /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
    significant byte first (like Motorola and SPARC, unlike Intel). */
-#if defined AC_APPLE_UNIVERSAL_BUILD
-# if defined __BIG_ENDIAN__
-#  define WORDS_BIGENDIAN 1
-# endif
-#else
-# ifndef WORDS_BIGENDIAN
-#  undef WORDS_BIGENDIAN
-# endif
-#endif
+#mesondefine WORDS_BIGENDIAN
 
 /* Enable large inode numbers on Mac OS X 10.5.  */
 #ifndef _DARWIN_USE_64_BIT_INODE

meson.build

@@ -206,6 +206,9 @@ cdata.set('MEMORY_ALIGNMENT_MALLOC', 1)
 cdata.set_quoted('PA_ALSA_PATHS_DIR', alsadatadir / 'paths')
 cdata.set_quoted('PA_ALSA_PROFILE_SETS_DIR', alsadatadir / 'profile-sets')
 
+if host_machine.endian() == 'big'
+  cdata.set('WORDS_BIGENDIAN', 1)
+endif
 
 check_headers = [['dlfcn.h','HAVE_DLFCN_H'],
   ['inttypes.h', 'HAVE_INTTYPES_H'],