Update Config.cmake

Author: ZilverBlade

Config.cmake

@@ -19,6 +19,7 @@ if (PYRO_PLATFORM_WINDOWING)
 	else()
 		# Set macros accordingly
 		if(PYRO_PLATFORM_WINDOWING_SYSTEM STREQUAL "GLFW")
+			add_definitions(-DPYRO_PLATFORM_WINDOWING_GLFW 1)
 			set(PYRO_PLATFORM_WINDOWING_GLFW 1)
 			set(PYRO_PLATFORM_WINDOWING_DIRNAME "Glfw")
 		else()
@@ -34,4 +35,4 @@ if (UNIX AND NOT APPLE)
 endif()
 if (WIN32)
 	set(PYRO_PLATFORM_DIRNAME "Windows")
-endif()
+endif()