use global CROSS_COMPILE prefix to define compilers for matiec and canfestival

matiec is compiled with different compiler than binaries shipped with mingw,
therefore it needs own versions of runtime libraries (libgcc_s_sjlj.dll, libstdc++.dll).
Andrey Skvortsov <andrej.skvortzov@gmail.com>
Andrej

upgrade zope.interface python package to version 4.3.2
Andrey Skvortsov <andrej.skvortzov@gmail.com>
Andrej

upgrade wxglade to version: 0.7.2 (2016-10-21)
Andrey Skvortsov <andrej.skvortzov@gmail.com>
Andrej

fix regexp for md5 files in .hgignore

Added msys' make, bash and coreutils with mingw binaries

Updated MD5 checksum in distfiles

Various updates and enhancement in installer build system, including support for specialized distributions, existing in other branches