automatic dependencies adjustment:
        * config/arc/t-arc: Delete.
        * config/arc/arc.opt (mdsp-packa, mdvbf): Don't RejectNegative.
        (mmac-d16, mmac-24, mlock, mswape, mrtsc): Likewise.

        Add mno-* tests as compile-only tests:
        * testsuite/gcc.target/arc/mno-dsp-packa.c: New test.
        * testsuite/gcc.target/arc/mno-dvbf.c: Likewise.
        * testsuite/gcc.target/arc/mno-lock.c: Likewise.
        * testsuite/gcc.target/arc/mno-mac-24.c: Likewise.
        * testsuite/gcc.target/arc/mno-mac-d16.c: Likewise.
        * testsuite/gcc.target/arc/mno-rtsc.c: Likewise.
        * testsuite/gcc.target/arc/mno-swape.c: Likewise.