Rework Kconfig defaults

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

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

Fixes distclean and forces MATH and C99

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Remove GNUmakefile.in upon distclean

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Also remove rtai_config* upon distclean

Signed-off-by: Alec Ari <neotheuser@ymail.com>
Remove m4 files in dir

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