fix example build on macos (#1022)

examples/Makefile

@@ -321,7 +321,7 @@ ifeq ($(PLATFORM),PLATFORM_DESKTOP)
     ifeq ($(PLATFORM_OS),OSX)
         # Libraries for OSX 10.9 desktop compiling
         # NOTE: Required packages: libopenal-dev libegl1-mesa-dev
-        LDLIBS = -lraylib -framework OpenGL -framework OpenAL -framework Cocoa
+        LDLIBS = -lraylib -framework OpenGL -framework OpenAL -framework Cocoa -framework CoreVideo -framework IOKit
     endif
     ifeq ($(PLATFORM_OS),BSD)
         # Libraries for FreeBSD, OpenBSD, NetBSD, DragonFly desktop compiling