* Don't try to mix incompatible optimization flags in debug builds.
* Workaround ax_cc_maxopt.m4 not supporting MSVC and change -O3 to -O2.
* Fix MSVC warning by properly passing linker flags to compiler.
* Make msvcc.sh return 1 if invalid command line options are used rather than silently eating them.
* Add more comments.
This was originally done in PR #84, except the change was made to Makefile.in instead of Makefile.am and was therefore reverted the next time the files were regenerated.
Ryan VanderMeulen