exclude freetype.cpp file from being included in windows build

Author: swdee

contrib/freetype.cpp

@@ -1,3 +1,6 @@
+
+#ifndef _WIN32  // Exclude compiling on Windows platforms
+
 #include "freetype.h"
 
 FreeType2 FreeType2_CreateFreeType2() {
@@ -28,4 +31,6 @@ Size FreeType2_GetTextSize(FreeType2 f, const char *text,
                            int fontHeight, int thickness, int *baseLine) {
     cv::Size sz = (*f)->getTextSize(text, fontHeight, thickness, baseLine);
     return Size{sz.width, sz.height};
-}
+}
+
+#endif // _WIN32