* Make GL_EXT() a noop on OS X, it's not required.

* Conditionalise glMultiDrawArraysFallback since it's not used on OS X.
 * Stub APIENTRY at the top of visual_tool_vector_clip.cpp, this should never be added to a header but at the top of source files.

Originally committed to SVN as r4737.

aegisub/src/gl_wrap.h

@@ -57,12 +57,17 @@ typedef GLuint GLhandleARB;
 #define glGetProc(a) glXGetProcAddress((const GLubyte *)(a))
 #endif
 
+#if defined(__APPLE__)
+// Not required on OS X.
+#define GL_EXT(type, name)
+#else
+
 #define GL_EXT(type, name) \
 	static type name = reinterpret_cast<type>(glGetProc(#name)); \
 	if (!name) { \
 		name = & name ## Fallback; \
 	}
-
+#endif
 
 
 /// DOCME

aegisub/src/visual_tool_vector_clip.cpp

@@ -47,6 +47,11 @@
 #include <algorithm>
 #endif
 
+#ifdef __APPLE__
+/// Noop macro, this should never be defined in a header.
+#define APIENTRY
+#endif
+
 #include "config.h"
 
 #include "ass_dialogue.h"
@@ -112,11 +117,14 @@ void VisualToolVectorClip::SetMode(int newMode) {
 }
 
 // Substitute for glMultiDrawArrays for sub-1.4 OpenGL
+// Not required on OS X.
+#ifndef __APPLE__
 static void APIENTRY glMultiDrawArraysFallback(GLenum mode, GLint *first, GLsizei *count, GLsizei primcount) {
 	for (int i = 0; i < primcount; ++i) {
 		glDrawArrays(mode, *first++, *count++);
 	}
 }
+#endif
 
 static bool is_move(SplineCurve const& c) {
 	return c.type == CURVE_POINT;