Make changes to use pure MSYS2 tools to build Qt
Some fixes for MSYS2.
Change variable increment operator because it sometimes doesn't work.
Python: Search msys-2.0.dll instead msys-1.0.dll.
Add patch to fix openssl man building with recent Perl.
Add patches to fix Perl file reading problem and using MSYS2 flex instead win_flex.
Workaround for building DMAKE
Unset SHELL because it break building Perl and Qt.
Remove workaround - fixed in MSYS2
Use workaround for INSTALL_ROOT because something wrong in MSYS2 args conversion.
Optimize scripts to use msys-tools (except Perl).
Fix Qt5 scripts to use msys-tools.
Fix syntax error
Some cosmetic changes in openssl script
Fix passed OpenGL option
Use different install folders for building Qt from different git branches.
Switch to use bat file for configure
Trying fix issue with building release branch
Fix building release branch.
Under Windows right method to configure is using configure.bat or configure.exe