Comment non thead-safe setlocale

Index: rtexif/rtexif.cc
--- rtexif/rtexif.cc.orig
+++ rtexif/rtexif.cc
@@ -2788,7 +2788,7 @@ void ExifManager::parse (bool isRaw, bool skipIgnored,
         #endif
         return;
     }
-    setlocale (LC_NUMERIC, "C"); // to set decimal point in sscanf
+    //setlocale (LC_NUMERIC, "C"); // to set decimal point in sscanf
 
     if (order == ByteOrder::UNKNOWN) {
         // read tiff header
