[#26] Fixed weird cmake behavior hopefully

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

modules/asset_loader/CMakeLists.txt

@@ -31,9 +31,9 @@ endif ()
 
 # Check and load FX-GLTF
 if (EXISTS "${vkcv_asset_loader_lib_path}/fx-gltf")
-	set(FX_GLTF_INSTALL OFF)
-	set(FX_GLTF_USE_INSTALLED_DEPS OFF)
-	set(BUILD_TESTING OFF)
+	set(FX_GLTF_INSTALL OFF CACHE INTERNAL "")
+	set(FX_GLTF_USE_INSTALLED_DEPS OFF CACHE INTERNAL "")
+	set(BUILD_TESTING OFF CACHE INTERNAL "")
 	
 	add_subdirectory(${vkcv_asset_loader_lib}/fx-gltf)