qt5: add initial qt5 to mxe-octave, based on mxe.cc * src/qt5.mk: new file * src/qtbase-1-fixes.patch: new file * src/qtbase.mk: new file * src/qtimageformats-1.patch: new file * src/qtimageformats.mk: new file * src/qtsvg.mk: new file * src/qttools-1.patch: new file * added src/qttools.mk: new file * changed Makefile.in: added ENABLE_QT5 option * configure.ac: added enable-qt5 option * index.html: added new files to packages * installer-files/octave-firsttime.vbs: added setup of qt5 bin, plugin path * installer-files/octave.vbs: added setup of qt5 bin, plugin path * installer-files/octave.bat: added setup of qt5 bin path * src/default-octave.mk: added settig fot qt5 usage * src/qscintilla.mk: added qt5 path

# This file is part of MXE.
# See index.html for further information.

This patch has been taken from:
http://bugs.gentoo.org/show_bug.cgi?id=305101
http://repos.archlinux.org/wsvn/packages/gd/trunk/libpng14.patch

--- a/gd_png.c
+++ b/gd_png.c
@@ -149,7 +149,7 @@
 	return NULL;
   }
 
-	if (!png_check_sig (sig, 8)) { /* bad signature */
+	if (png_sig_cmp (sig, 0, 8)) { /* bad signature */
     	return NULL;		/* bad signature */
 	}