mac-vth264: Remove OSX 10.8 compatibility code

OBS no longer supports building on OSX. The minimum version of macOS
that we support is macOS 10.13. We can safely remove this 10.8
compatibility code.

plugins/mac-vth264/encoder.c

@@ -19,20 +19,6 @@
 #define VT_BLOG(level, format, ...) \
 	VT_LOG_ENCODER(enc->encoder, level, format, ##__VA_ARGS__)
 
-// Clipped from NSApplication as it is in a ObjC header
-extern const double NSAppKitVersionNumber;
-#define NSAppKitVersionNumber10_8 1187
-
-// Get around missing symbol on 10.8 during compilation
-enum {
-	kCMFormatDescriptionBridgeError_InvalidParameter_ = -12712,
-};
-
-static bool is_appkit10_9_or_greater()
-{
-	return floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_8;
-}
-
 static DARRAY(struct vt_encoder {
 	const char *name;
 	const char *disp_name;
@@ -616,7 +602,7 @@ static bool convert_sample_to_annexb(struct vt_h264_encoder *enc,
 		format_desc, 0, NULL, NULL, &param_count, &nal_length_bytes);
 	// it is not clear what errors this function can return
 	// so we check the two most reasonable
-	if (code == kCMFormatDescriptionBridgeError_InvalidParameter_ ||
+	if (code == kCMFormatDescriptionBridgeError_InvalidParameter ||
 	    code == kCMFormatDescriptionError_InvalidParameter) {
 		VT_BLOG(LOG_WARNING, "assuming 2 parameter sets "
 				     "and 4 byte NAL length header");
@@ -993,12 +979,6 @@ void register_encoders()
 
 bool obs_module_load(void)
 {
-	if (!is_appkit10_9_or_greater()) {
-		VT_LOG(LOG_WARNING, "Not adding VideoToolbox H264 encoder; "
-				    "AppKit must be version 10.9 or greater");
-		return false;
-	}
-
 	encoder_list_create();
 	register_encoders();