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9e94d2b040
This creates a single M4 macro PHP_CHECK_BUILTIN and removes other PHP_CHECK_BUILTIN_* macros. Checks are wrapped in AC_CACHE_CHECK and PHP_HAVE_BUILTIN_* CPP macro definitions are defined to 1 if builtin is found and undefined if not. This also changes all PHP_HAVE_BUILTIN_ symbols to be either undefined or defined (to value 1) and syncs all #if/ifdef/defined usages of them in the php-src code. This way it is simpler to use them because they don't need to be defined to value 0 on Windows, for example. This is done as previous usages in php-src were mixed and on many places they were only checked with ifdef.