Makefile.in (insn-*.[ch], [...]): When using a trailing semicolon to force a rule to not do anything...

        * Makefile.in (insn-*.[ch], protoize.o, unprotoize.o, install): When
        using a trailing semicolon to force a rule to not do anything,
        explicitly run the command `true', to avoid warnings or other
        problems with versions of make which don't like null commands.

From-SVN: r3349