Fix EGL support on macOS

EGL is available on macOS via ANGLE. Use the dylibs provided by it and
ensure EGL is enabled in the code when it is in the build.

Author: mohd-akram

src/dispatch_common.c

@@ -175,9 +175,10 @@
 
 #if defined(__APPLE__)
 #define GLX_LIB "/opt/X11/lib/libGL.1.dylib"
+#define EGL_LIB "libEGL.dylib"
+#define GLES1_LIB "libGLESv1_CM.dylib"
+#define GLES2_LIB "libGLESv2.dylib"
 #define OPENGL_LIB "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL"
-#define GLES1_LIB "libGLESv1_CM.so"
-#define GLES2_LIB "libGLESv2.so"
 #elif defined(__ANDROID__)
 #define GLX_LIB "libGLESv2.so"
 #define EGL_LIB "libEGL.so"

src/dispatch_common.h

@@ -28,7 +28,7 @@
 #define PLATFORM_HAS_GLX ENABLE_GLX
 #define PLATFORM_HAS_WGL 1
 #elif defined(__APPLE__)
-#define PLATFORM_HAS_EGL 0 
+#define PLATFORM_HAS_EGL ENABLE_EGL
 #define PLATFORM_HAS_GLX ENABLE_GLX
 #define PLATFORM_HAS_WGL 0
 #elif defined(ANDROID)