removed useless code

Found while reviewing #3880

code/AssetLib/Collada/ColladaParser.cpp

@@ -231,11 +231,7 @@ void ColladaParser::UriDecodePath(aiString &ss) {
 
     // Maxon Cinema Collada Export writes "file:///C:\andsoon" with three slashes...
     // I need to filter it without destroying linux paths starting with "/somewhere"
-#if defined(_MSC_VER)
     if (ss.data[0] == '/' && isalpha((unsigned char)ss.data[1]) && ss.data[2] == ':') {
-#else
-    if (ss.data[0] == '/' && isalpha((unsigned char)ss.data[1]) && ss.data[2] == ':') {
-#endif
         --ss.length;
         ::memmove(ss.data, ss.data + 1, ss.length);
         ss.data[ss.length] = 0;

code/AssetLib/X/XFileImporter.cpp

@@ -667,9 +667,7 @@ void XFileImporter::ConvertMaterials( aiScene* pScene, std::vector<XFile::Materi
 
                 // convert to lower case for easier comparison
                 for ( unsigned int c = 0; c < sz.length(); ++c ) {
-                    if ( isalpha( (unsigned char) sz[ c ] ) ) {
-                        sz[ c ] = (char) tolower( (unsigned char) sz[ c ] );
-                    }
+                    sz[ c ] = (char) tolower( (unsigned char) sz[ c ] );
                 }
 
                 // Place texture filename property under the corresponding name