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

diff -ur octave-sockets-1.2.0.orig/src/Makefile octave-sockets-1.2.0/src/Makefile
--- octave-sockets-1.2.0.orig/src/Makefile	2015-03-20 10:24:40.824141293 -0400
+++ octave-sockets-1.2.0/src/Makefile	2015-03-20 11:31:54.325799984 -0400
@@ -8,12 +8,15 @@
 SRC := $(OCT:.oct=.cc)
 
 MKOCTFILE ?= mkoctfile -Wall
+OCTAVE_CONFIG ?= octave-config
 OCTAVE ?= octave
 
+CANONICAL_HOST_TYPE := $(shell $(OCTAVE_CONFIG) -p CANONICAL_HOST_TYPE))
+
 #The following is necessary to get the sockets package working in Windows.
 #It has been tried on Win7 and XP, in Octave 3.8.0 using mxe-octave (mingw)
 EXTRALIBS := 
-ifeq ($(OS),Windows_NT)
+ifneq (,$(findstring mingw,$(CANONICAL_HOST_TYPE)))
   EXTRALIBS := -lws2_32
 endif