Makefile.in (install, [...]): Make these phony targets.

        * Makefile.in (install, install-info, installdirs, uninstall): Make
        these phony targets.
So we don't overwrite a newer version of texinfo that might already be
installed on the system.

        * makeinfo/makeinfo.c: Maybe include <stdlib.h> for malloc et al.
        * util/install-info.c: Include <string*.h>.
        (my_strerror): Use strerror if available.
Avoids alpha bug and redecl of sys_errlist problems.

From-SVN: r15051