Port build system to MinGW-W64/Cygwin

This requires the ability to specify executable-suffixes. We trick a
bit by not diving into the import library madness for MSVC and instead
act as if we exported the import library "libgrapheme.lib", which
however is just the static library.

Signed-off-by: Laslo Hunhold <dev@frign.de>
3 files changed