gcc=<n> <n> = value of ${HAVE_GCC}
gdb=<n> <n> = value of ${HAVE_GDB}
* Support extra keywords on lines with "obsolete" keywords to allow
keyword-specific obsolete files.
(Primarily intended for use with gcc=<n> and gdb=<n>, although
it could be use for other items).
* Use the above features to collapse the gcc.* and gcc4.* lists into
the appropriate set lists.
* Deprecate the tc.* lists as all platforms are either HAVE_GCC=3 or HAVE_GCC=4.
* Update set lists for HAVE_GDB=6.
5666bd9aa8