In some cases this will introduce cycles which could likely be cleaned
up by only depending on some unix tools instead of the whole autotools.
Rebuilding doesn't make much sense at this point since it just adds a subset
of base-devel which is still installed by default.
There is code in libevent to obtain the list of name server IPs the
Windows way, but it was disabled when building in MSYS mode.
To avoid conflicts between the Win32 and the MSYS headers, a hack is
needed where the `evutil_load_windows_system_library_()` function no
longer uses any Win32 types but plain C ones.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>