Remove hardcoded optimization level.

Index: build/te4core.lua
--- build/te4core.lua.orig
+++ build/te4core.lua
@@ -41,7 +41,7 @@ project "TEngine"
 	if _OPTIONS.discord then defines { "DISCORD_TE4" } end
 	defines { "_DEFAULT_VIDEOMODE_FLAGS_='SDL_HWSURFACE|SDL_DOUBLEBUF'" }
 	defines { [[TENGINE_HOME_PATH='".t-engine"']], "TE4CORE_VERSION="..TE4CORE_VERSION }
-	buildoptions { "-O3" }
+	--buildoptions { "-O3" }
 
 	if _OPTIONS.relpath=="32" then linkoptions{"-Wl,-rpath -Wl,\\\$\$ORIGIN/lib "} end
 	if _OPTIONS.relpath=="64" then linkoptions{"-Wl,-rpath -Wl,\\\$\$ORIGIN/lib64 "} end
