Fix compilation without wechat_qrcode on Mac OS.

Emgu.CV.Extern/wechat_qrcode/wechat_qrcode_c.cpp

@@ -11,7 +11,7 @@ cv::wechat_qrcode::WeChatQRCode* cveWeChatQRCodeCreate(
     cv::String* superResolutionPrototxtPath,
     cv::String* superResolutionCaffeModelPath)
 {
-#if HAVE_OPENCV_WECHAT_QRCODE
+#ifdef HAVE_OPENCV_WECHAT_QRCODE
     return new cv::wechat_qrcode::WeChatQRCode(
         *detectorPrototxtPath,
         *detectorCaffeModelPath,
@@ -19,17 +19,17 @@ cv::wechat_qrcode::WeChatQRCode* cveWeChatQRCodeCreate(
         *superResolutionCaffeModelPath);
 #else
     throw_no_wechat_qrcode();
-#endif;
+#endif
 }
 
 void cveWeChatQRCodeRelease(cv::wechat_qrcode::WeChatQRCode** detector)
 {
-#if HAVE_OPENCV_WECHAT_QRCODE
+#ifdef HAVE_OPENCV_WECHAT_QRCODE
     delete* detector;
     *detector = 0;
 #else
     throw_no_wechat_qrcode();
-#endif;
+#endif
 }
 
 void cveWeChatQRCodeDetectAndDecode(
@@ -38,7 +38,7 @@ void cveWeChatQRCodeDetectAndDecode(
     cv::_OutputArray* points,
     std::vector<std::string>* results)
 {
-#if HAVE_OPENCV_WECHAT_QRCODE
+#ifdef HAVE_OPENCV_WECHAT_QRCODE
     std::vector<std::string> r = detector->detectAndDecode(*img, *points);
     results->clear();
 	for (std::vector<std::string>::iterator it = r.begin(); it != r.end(); it++)
@@ -47,5 +47,5 @@ void cveWeChatQRCodeDetectAndDecode(
 	}
 #else
     throw_no_wechat_qrcode();
-#endif;
+#endif
 }