add cross compile with mxe

cross_compile.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -xe
+
+# git clone https://github.com/mxe/mxe.git
+# cd mxe && make qtbase
+# make -j 4 qt qt5 MXE_TARGETS='x86_64-w64-mingw32.shared i686-w64-mingw32.shared x86_64-w64-mingw32.static i686-w64-mingw32.static'
+# make qtbase
+
+# set correct path
+MXE_ROOT=$1
+export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$MXE_ROOT/usr/bin
+
+# run make file generator
+cmd=$MXE_ROOT/usr/bin/i686-w64-mingw32.static-qmake-qt5
+$cmd
+
+# clean and make
+make clean
+make