Added more '#pragma implementation' for gcc.

Replaced wxString[0u] by wxString[(size_t) 0]: size_t is signed for EMX,
        so explicitly using '0u' causes problems.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5608 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/mimetype.cpp

@@ -318,7 +318,7 @@ wxMimeTypesManagerImpl::GetFileTypeFromExtension(const wxString& ext)
 {
     // add the leading point if necessary
     wxString str;
-    if ( ext[0u] != wxT('.') ) {
+    if ( ext[(size_t) 0] != wxT('.') ) {
         str = wxT('.');
     }
     str << ext;