Purge RTAI_MATH_KMOD_CFLAGS

RTAI_MATH_KMOD_CFLAGS now does more
harm than good. LinuxCNC no longer compiles with this,
and the RTAI does not need this either.

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Re-enable automatic configure

Re-enable automatic configure script
when running autogen.sh

make menuconfig doesn't work without it.

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Remove now dead code

This code was killed in a patch I wrote,
might as well finish it off. When I find
a better fix for getting make menuconfig to
run again, I'll reenable this. For now,
I suggest not cross compiling.

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Add .config files to .gitignore

Add the kconfig .config files to .gitignore

Signed-off-by: Alec Ari <neotheuser@ymail.com>