Autoconf 2.55 "make install" failure on Solaris 9 (sparc)

[Paul Eggert]

This is a regression from Autoconf 2.54c.  Here are the symptoms of
the "make install" failure:

        /bin/bash ../config/mkinstalldirs /tmp/prefix/bin
        mkdir -p -- /tmp/prefix/bin
         ../config/install-sh -c autom4te /tmp/prefix/bin/autom4te
        bash: ../config/install-sh: bad interpreter: Permission denied
        *** Error code 126
        make: Fatal error: Command failed for target `install-binSCRIPTS'
        Current working directory /tmp/src/autoconf-2.55/bin
        *** Error code 1
        make: Fatal error: Command failed for target `install-am'
        Current working directory /tmp/src/autoconf-2.55/bin
        *** Error code 1
        make: Fatal error: Command failed for target `install-recursive'

The fix is to "chmod a+x config/install-sh" by hand.

I'm not sure how this happened; perhaps during the release process?