Add in potential Mac OS adjustments to make the PGE run with OpenGL3.3 flag.

Adventures in Lestoria/olcPixelGameEngine.h

@@ -1466,10 +1466,14 @@ namespace X11 {
 
 #if defined(__APPLE__)
 #define GL_SILENCE_DEPRECATION
+#define CALLSTYLE
+#define OGL_LOAD(t, n) n;
+#define GL_GLEXT_PROTOTYPES
 #include <OpenGL/OpenGL.h>
-#include <OpenGL/gl.h>
+#include <OpenGl/gl3ext.h>
+#include <OpenGL/gl3.h>
 #include <OpenGL/glu.h>
-#define CALLSTYLE
+#include <OpenGL/gltypes.h>
 #endif
 
 #if defined(OLC_PLATFORM_EMSCRIPTEN)
@@ -1529,10 +1533,18 @@ namespace olc
 #if defined(OLC_PLATFORM_EMSCRIPTEN)
 	typedef void CALLSTYLE locShaderSource_t(GLuint shader, GLsizei count, const GLchar* const* string, const GLint* length);
 	typedef EGLBoolean(locSwapInterval_t)(EGLDisplay display, EGLint interval);
-#else
-	#ifndef OLC_GFX_HEADLESS
-		typedef void CALLSTYLE locShaderSource_t(GLuint shader, GLsizei count, const GLchar** string, const GLint* length);
-	#endif
+#endif
+
+#if defined(__APPLE__)
+    typedef int EGLBoolean;
+    typedef int32_t EGLint;
+    typedef void *EGLDisplay;
+    typedef void *EGLConfig;
+    typedef void *EGLSurface;
+    typedef void *EGLContext;
+
+    typedef EGLBoolean(locSwapInterval_t)(EGLDisplay display, GLint interval);
+    typedef void CALLSTYLE locShaderSource_t(GLuint shader, GLsizei count, const GLchar* const* string, const GLint* length);
 #endif
 
 } // olc namespace