Refactor checks for fpathconf and pathconf

These two might not be available everywhere so we check them in
config.m4 when doing the configure step.

Constants that are defined into main/php_config.h:
HAVE_FPATHCONF
HAVE_PATHCONF

Implemented via phpGH-10238
Related to phpGH-10350
Fixes phpGH-12725

Author: petk

ext/posix/config.m4

@@ -10,7 +10,7 @@ if test "$PHP_POSIX" = "yes"; then
 
   AC_CHECK_HEADERS([sys/mkdev.h sys/sysmacros.h])
 
-  AC_CHECK_FUNCS(seteuid setegid setsid getsid getpgid ctermid mkfifo mknod setrlimit getrlimit getgroups makedev initgroups getgrgid_r posix_pathconf eaccess)
+  AC_CHECK_FUNCS(seteuid setegid setsid getsid getpgid ctermid mkfifo mknod setrlimit getrlimit getgroups makedev initgroups getgrgid_r pathconf fpathconf eaccess)
 
   AC_MSG_CHECKING([for working ttyname_r() implementation])
   AC_RUN_IFELSE([AC_LANG_SOURCE([[

ext/posix/posix.c

@@ -533,8 +533,8 @@ PHP_FUNCTION(posix_isatty)
 /* }}} */
 
 /*
-	POSIX.1, 4.8.1 sysconf() - TODO
-	POSIX.1, 5.7.1 pathconf(), fpathconf() - TODO
+	POSIX.1, 4.8.1 sysconf()
+	POSIX.1, 5.7.1 pathconf(), fpathconf()
 
 	POSIX.1, 5.1.2 opendir(), readdir(), rewinddir(), closedir()
 	POSIX.1, 5.2.1 chdir()
@@ -1240,7 +1240,7 @@ PHP_FUNCTION(posix_sysconf)
 	RETURN_LONG(sysconf(conf_id));
 }
 
-#ifdef HAVE_POSIX_PATHCONF
+#ifdef HAVE_PATHCONF
 PHP_FUNCTION(posix_pathconf)
 {
 	zend_long name, ret;
@@ -1269,7 +1269,9 @@ PHP_FUNCTION(posix_pathconf)
 
 	RETURN_LONG(ret);
 }
+#endif
 
+#ifdef HAVE_FPATHCONF
 PHP_FUNCTION(posix_fpathconf)
 {
 	zend_long name, ret, fd = 0;

ext/posix/posix.stub.php

@@ -432,8 +432,11 @@ function posix_initgroups(string $username, int $group_id): bool {}
 
 function posix_sysconf(int $conf_id): int {}
 
-#ifdef HAVE_POSIX_PATHCONF
+#ifdef HAVE_PATHCONF
 function posix_pathconf(string $path, int $name): int|false {}
+#endif
+
+#ifdef HAVE_FPATHCONF
 /** @param resource|int $file_descriptor */
 function posix_fpathconf($file_descriptor, int $name): int|false {}
 #endif