Converted GLAD to header only

src/Makefile

@@ -92,13 +92,7 @@ else
 endif
 
 # define all object files required
-ifeq ($(PLATFORM),PLATFORM_DESKTOP)
-    OBJS = core.o rlgl.o glad.o shapes.o text.o textures.o models.o audio.o utils.o camera.o gestures.o stb_vorbis.o
-else
-    #GLAD only required on desktop platform
-    OBJS = core.o rlgl.o shapes.o text.o textures.o models.o audio.o stb_vorbis.o utils.o camera.o gestures.o
-endif
-
+OBJS = core.o rlgl.o shapes.o text.o textures.o models.o audio.o utils.o camera.o gestures.o stb_vorbis.o
 
 # typing 'make' will invoke the default target entry called 'all',
 # in this case, the 'default' target entry is raylib
@@ -153,10 +147,6 @@ camera.o: camera.c
 gestures.o: gestures.c
 	$(CC) -c gestures.c $(CFLAGS) $(INCLUDES) -D$(PLATFORM)
 
-# compile glad module
-glad.o: external/glad.c
-	$(CC) -c external/glad.c $(CFLAGS) $(INCLUDES)
-
 # compile stb_vorbis library
 stb_vorbis.o: external/stb_vorbis.c
 	$(CC) -c external/stb_vorbis.c -O1 $(INCLUDES) -D$(PLATFORM)

src/rlgl.c

@@ -48,7 +48,8 @@
     #ifdef __APPLE__ 
         #include <OpenGL/gl3.h>     // OpenGL 3 library for OSX
     #else
-        #include "external/glad.h"  // GLAD library, includes OpenGL headers
+        #define GLAD_IMPLEMENTATION
+        #include "external/glad.h"  // GLAD extensions loading library, includes OpenGL headers
     #endif
 #endif