Fix LD_LIBRARY_PATH delimiter.
Run autoupdate on configure.ac.
Remove rpath directive from game/cgame Makefile.am. It wasn't doing anything useful anyway.
Cosmetics for configure.ac.
Add an omissions list to sobundler.
Use PKG_CHECK_MODULES for SDL* and cURL.
Specify whether we not static or shared libtool libraries. This speeds up the build, as by default libtool builds both.