Ignore untracked file changes in some submodules

These files are probably nothing of great importance to our
development and thus have no business showing up in our git status

.gitmodules

@@ -4,12 +4,14 @@
 [submodule "glm"]
 	path = libs/glm
 	url = https://github.com/nigelbarink/glm.git
+	ignore = untracked
 [submodule "spdlog"]
 	path = libs/spdlog
 	url = https://github.com/nigelbarink/spdlog.git
 [submodule "tinygltf"]
 	path = libs/tinygltf
 	url = https://github.com/syoyo/tinygltf.git
+	ignore = untracked
 [submodule "GorrillaAudio"]
 	path = libs/GorillaAudio
 	url = https://github.com/mewspring/gorilla-audio.git
@@ -22,6 +24,7 @@
 [submodule "libs/steam-audio"]
 	path = libs/steam-audio
 	url = https://github.com/ValveSoftware/steam-audio.git
+	ignore = untracked
 [submodule "libs/physx"]
 	path = libs/physx
 	url = https://git.barink.dev/Nigel/PhysX.git