Remove 15 bit video for OS X. This mode doesn't seem to work.

This also fixes 2-bit, 4-bit, and 8-bit modes.

BasiliskII/src/Unix/video_x.cpp

@@ -1637,6 +1637,12 @@ bool VideoInit(bool classic)
 		return false;
 	}
 	std::sort(avail_depths, avail_depths + num_depths);
+
+#ifdef __APPLE__
+	// 15-bit color does not seem to work on OS X
+	int *last = std::remove(avail_depths, avail_depths + num_depths, 15);
+	num_depths = ( (size_t)last - (size_t)avail_depths ) / sizeof(int);
+#endif
 	
 #ifdef ENABLE_FBDEV_DGA
 	// Frame buffer name