Fix [-Wstrict-prototypes] in GD extension .c files

Author: Girgias

ext/gd/config.m4

@@ -138,7 +138,7 @@ dnl
 if test "$PHP_GD" != "no"; then
 
   if test "$PHP_EXTERNAL_GD" = "no"; then
-    GD_CFLAGS=""
+    GD_CFLAGS="-Wno-strict-prototypes"
     extra_sources="libgd/gd.c libgd/gd_gd.c libgd/gd_gd2.c libgd/gd_io.c libgd/gd_io_dp.c \
                   libgd/gd_io_file.c libgd/gd_ss.c libgd/gd_io_ss.c libgd/gd_webp.c \
                   libgd/gd_png.c libgd/gd_jpeg.c libgd/gdxpm.c libgd/gdfontt.c libgd/gdfonts.c \

ext/gd/gd.c

@@ -137,7 +137,7 @@ static void _php_image_create_from(INTERNAL_FUNCTION_PARAMETERS, int image_type,
 static void _php_image_output(INTERNAL_FUNCTION_PARAMETERS, int image_type, char *tn, void (*func_p)());
 static gdIOCtx *create_stream_context_from_zval(zval *to_zval);
 static gdIOCtx *create_stream_context(php_stream *stream, int close_stream);
-static gdIOCtx *create_output_context();
+static gdIOCtx *create_output_context(void);
 static int _php_image_type(char data[12]);
 
 /* output streaming (formerly gd_ctx.c) */
@@ -217,7 +217,7 @@ void php_gd_assign_libgdimageptr_as_extgdimage(zval *val, gdImagePtr image)
 	php_gd_exgdimage_from_zobj_p(Z_OBJ_P(val))->image = image;
 }
 
-static void php_gd_object_minit_helper()
+static void php_gd_object_minit_helper(void)
 {
 	zend_class_entry ce;
 	INIT_CLASS_ENTRY(ce, "GdImage", class_GdImage_methods);
@@ -1446,7 +1446,7 @@ static int _php_image_type (char data[12])
 /* }}} */
 
 /* {{{ _php_image_create_from_string */
-gdImagePtr _php_image_create_from_string(zend_string *data, char *tn, gdImagePtr (*ioctx_func_p)())
+gdImagePtr _php_image_create_from_string(zend_string *data, char *tn, gdImagePtr (*ioctx_func_p)(gdIOCtx * infile))
 {
 	gdImagePtr im;
 	gdIOCtx *io_ctx;

ext/gd/libgd/gdft.c

@@ -774,7 +774,7 @@ void gdFontCacheShutdown()
 	gdMutexUnlock(gdFontCacheMutex);
 }
 
-void gdFreeFontCache()
+void gdFreeFontCache(void)
 {
 	gdFontCacheShutdown();
 }