TgaImporter: open the files as binary.

Took me TWO CRAZY HOURS of blaming visual studio, as it stopped reading
in the middle of the file without any reasonable error message ("stream
error", haha).

src/MagnumPlugins/TgaImporter/TgaImporter.cpp

@@ -62,7 +62,7 @@ void TgaImporter::doOpenData(const Containers::ArrayReference<const unsigned cha
 }
 
 void TgaImporter::doOpenFile(const std::string& filename) {
-    in = new std::ifstream(filename);
+    in = new std::ifstream(filename, std::ifstream::binary);
     if(in->good()) return;
 
     Error() << "Trade::TgaImporter::openFile(): cannot open file" << filename;