Cygwin build: Ensure we have cross-compile environment configured for imagemagick
Cygwin build: Explicitly disable lzma in ImageMagick
Cygwin build: Fix environment switch procedure for pkg-config
Cygwin build: Revert 3f05fb2b, because it's not really required
Merge pull request #51 from morevnaproject/0.64.1

Fix Cygwin build environment