Automatically apply patch when compiling SDL3.

SConscript

@@ -119,6 +119,14 @@ def _inject_dependency(dependency, kwargs: dict, add_sources: bool = True) -> No
         _inject_list(kwargs, dependency.cook_result, 'LIBS')
         for depdep in dependency.depdeps:
             _inject_dependency(depdep, kwargs)
+    elif isinstance(dependency, _Target):
+        _inject_list(kwargs, dependency.kwargs, 'CPPPATH')
+        _inject_list(kwargs, dependency.kwargs, 'CPPDEFINES')
+        _inject_list(kwargs, dependency.kwargs, 'LIBPATH')
+        _inject_list(kwargs, dependency.kwargs, 'LIBS')
+        _inject_list(kwargs, {'LIBS': [dependency]}, 'LIBS')
+        for depdep in dependency.dependencies:
+            _inject_dependency(depdep, kwargs)
 
 def _rglob(env: Environment, root_path: str, pattern: str, **kwargs):
     result_nodes = []
@@ -335,10 +343,11 @@ def _wrap_builder(builder, target_type: TargetType):
             if version_spec == {}:
                 dep_target = _find_target(env, name)
                 if dep_target is not None and dep_target.target_type == TargetType.LIBRARY:
-                    if 'LIBS' in kwargs:
-                        kwargs['LIBS'].append(dep_target)
-                    else:
-                        kwargs['LIBS'] = [dep_target]
+                    #if 'LIBS' in kwargs:
+                    #    kwargs['LIBS'].append(dep_target)
+                    #else:
+                    #    kwargs['LIBS'] = [dep_target]
+                    target_dependencies.append(dep_target)
                     continue
             target_dependencies.append(_add_dependency(env, name, _parse_version_spec(version_spec)))
 
@@ -747,6 +756,7 @@ env.Append(CPPDEFINES = [])
 env.Append(LINKFLAGS = [])
 
 # init SPP environment variables
+env['SPP_DIR'] = _spp_dir.abspath
 env['SPP_TARGETS'] = []
 env['SPP_DEFAULT_TARGETS'] = []
 env['SPP_TARGET_DEPENDENCIES'] = []