Don't add -pthreads compiler flag on MSVC.

globals.cmake

@@ -94,7 +94,9 @@ if(MIRRAGE_ENABLE_COTIRE)
 
 	if(COMMAND cotire)
 		add_definitions(-DGLM_FORCE_RADIANS -DGLM_FORCE_DEPTH_ZERO_TO_ON -DGLM_ENABLE_EXPERIMENTAL -DGLM_FORCE_CXX14)
-		add_compile_options(-pthread)
+		if(NOT MSVC)
+			add_compile_options(-pthread)
+		endif()
 		set_property(GLOBAL PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH "${MIRRAGE_ROOT_DIR}/dependencies")
 		set_property(GLOBAL PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${MIRRAGE_ROOT_DIR}/dependencies/nuklear;${MIRRAGE_ROOT_DIR}/src;${MIRRAGE_ROOT_DIR}/dependencies/moodycamel/concurrentqueue.h")
 		set_property(GLOBAL PROPERTY COTIRE_ADD_UNITY_BUILD FALSE)