Cleaned up references to win32 pre-generated headers

Moved pre-generated and static headers used for autotool-less
win32 builds out of include/ and into win32/. Centralized
the HAVE_CONFIG logic into two common headers, one for src/,
and one for test/. All source code should know include headers
from the same location, its the responsibility of the build
prep system (autotools or msvcbuild.bat) to make sure the
correct headers are in place.
Bump libnet versions in preparation for 1.2 release.
Prepare for 1.2 release candidate.