Fix #79557: extension_dir = ./ext now use current directory for base

For some reason, `ImageLoad()` fails to load images with a relative
path starting with `.\`  or `./`.  We work around this issue by
stripping those leading characters.

Author: cmb69

NEWS

@@ -7,6 +7,8 @@ PHP                                                                        NEWS
     called). (Laruence)
   . Fixed bug #79566 (Private SHM is not private on Windows). (cmb)
   . Fixed bug #79489 (.user.ini does not inherit). (cmb)
+  . Fixed bug #79557 (extension_dir = ./ext now use current directory for 
+    base). (cmb)
 
 - FFI:
   . Fixed bug #79571 (FFI: var_dumping unions may segfault). (cmb)

win32/winutil.c

@@ -440,7 +440,13 @@ PHP_WINUTIL_API char *php_win32_get_username(void)
 
 static zend_always_inline BOOL is_compatible(const char *name, BOOL is_smaller, char *format, char **err)
 {/*{{{*/
-	PLOADED_IMAGE img = ImageLoad(name, NULL);
+	/* work around ImageLoad() issue */
+	char *name_stripped = name;
+	if (name[0] == '.' && IS_SLASH(name[1])) {
+		name_stripped += 2;
+	}
+
+	PLOADED_IMAGE img = ImageLoad(name_stripped, NULL);
 
 	if (!img) {
 		DWORD _err = GetLastError();