Makefile.autotools.in: make MESSAGE output stand out

The following patch makes the MESSAGE Macro in Makefile.autotools.in
work.

I think it was originally intended to print the messages in bold type
but it doesn't appear to work correctly. This patch should work on all
platforms.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>

(Fixed to not continously call tput)