Use modules_enabled.gen.h to improve inter dependency checks

- Fix build with gdscript module disabled. Fixes #31011.
- Remove unused `gdscript` compile option.
- Fix build with regex module disabled.
- Fix ImageLoaderSVG to forward declare thirdparty structs.

modules/svg/SCsub

@@ -13,10 +13,6 @@ thirdparty_sources = [
 thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
 
 env_svg.Prepend(CPPPATH=[thirdparty_dir])
-# FIXME: Needed in editor/editor_themes.cpp for now, but ideally there
-# shouldn't be a dependency on modules/ and its own 3rd party deps.
-env.Prepend(CPPPATH=[thirdparty_dir])
-env.Append(CPPDEFINES=["SVG_ENABLED"])
 
 env_thirdparty = env_svg.Clone()
 env_thirdparty.disable_warnings()

modules/svg/image_loader_svg.cpp

@@ -30,9 +30,8 @@
 
 #include "image_loader_svg.h"
 
-#include "core/os/os.h"
-#include "core/print_string.h"
-#include "core/ustring.h"
+#include <nanosvg.h>
+#include <nanosvgrast.h>
 
 void SVGRasterizer::rasterize(NSVGimage *p_image, float p_tx, float p_ty, float p_scale, unsigned char *p_dst, int p_w, int p_h, int p_stride) {
 	nsvgRasterize(rasterizer, p_image, p_tx, p_ty, p_scale, p_dst, p_w, p_h, p_stride);

modules/svg/image_loader_svg.h

@@ -34,13 +34,14 @@
 #include "core/io/image_loader.h"
 #include "core/ustring.h"
 
-#include <nanosvg.h>
-#include <nanosvgrast.h>
-
 /**
 	@author Daniel Ramirez <djrmuv@gmail.com>
 */
 
+// Forward declare and include thirdparty headers in .cpp.
+struct NSVGrasterizer;
+struct NSVGimage;
+
 class SVGRasterizer {
 
 	NSVGrasterizer *rasterizer;