Fix pasting multiline text in wxOSX to not use \r

Use wxMacConvertNewlines13To10(), not wxMacConvertNewlines10To13() when
copying content from native pasteboard. Perform this conversion not only
for 8bit text, but for UTF-16 one (which is the one actually used on
modern OS X versions) as well.

src/osx/core/cfstring.cpp

@@ -34,6 +34,15 @@ void wxMacConvertNewlines13To10( char * data )
     }
 }
 
+void wxMacConvertNewlines13To10( char * data, size_t len )
+{
+    for ( ; len; ++data, --len )
+    {
+        if ( *data == 0x0d )
+            *data = 0x0a;
+    }
+}
+
 void wxMacConvertNewlines10To13( char * data )
 {
     char * buf = data ;