PKG_CONFIG does not really work on Windows, Strawberry perl's uses mingw
libraries, which VS compiler cannot use,

BOOST not used.

Tests main.query_cache_debug and main.mdev-504 timed out on debug build
at 2 minutes so increase the timeout to 4 minutes.

Overall build time was 30 min 44 seconds so plenty of time currently.
Signed-off-by: Daniel Black <daniel@linux.vnet.ibm.com>