configury: remove checks for C compilation.
configury: remove checks for C compilation.

* configure.ac (AM_PROG_AR, AC_PROG_CC, AX_LUA_HEADERS): Remove.
None of these are used unless we have C code to compile.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

gvvaughan/specl