bugfix: Use make_lower throughout for spritebank filenames (found and patched by Ion Dune)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2427 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

 Changes in 1.6
+ - bugfix: Use make_lower throughout for spritebank filenames (found and patched by Ion Dune)
+
+ - bugfix: CMountPointReader::openFile no longer returns true for empty files. Corresponding test added.
 
  - Direct3D now also uses screen coordinates in 2d mode, just like OpenGL. This means that screen coords are going from 0..ScreenWidth and 0..ScreenHeight instead of -1..1.
 

source/Irrlicht/CGUIEnvironment.cpp

@@ -1441,6 +1441,7 @@ IGUISpriteBank* CGUIEnvironment::addEmptySpriteBank(const core::string<c16>& nam
 
 	SSpriteBank b;
 	b.Filename = name;
+	b.Filename.make_lower();
 
 	const s32 index = Banks.binary_search(b);
 	if (index != -1)