AC_PROG_CC: don't check whether $CC supports "-c -o" together This reverts commit ce48964f. The extra code added by that commit was planned to be used by future version of Automake, but the implementation and future directions there have in the meantime be changed in a way that makes the extra code in Autoconf superfluous. Just get rid of it. * lib/autoconf/c.m4 (AC_PROG_CC): Adjust. Signed-off-by: Stefano Lattarini <[email protected]>