* m4/install-sh.m4: New file.

* m4/install-sh.m4: New file.
* m4/Makefile.am (m4data_DATA): Add install-sh.m4.
* m4/missing.m4 (AM_MISSING_INSTALL_SH): Move ...
* m4/install-sh.m4 (AM_PROG_INSTALL_SH): ... here.  Don't check
for install.sh any longer, always use install-sh, don't even
fall back to missing.  Use $am_aux_dir, making $install_sh absolute.
* m4/strip.m4 (AM_PROG_INSTALL_STRIP): Simplify, since $install_sh
is absolute.
* m4/init.m4: Adjust call to AM_PROG_INSTALL_SH.