AM_PATH_LISPDIR and dist_lisp_DATA when emacs is not installed breaks

[Simon Josefsson]

In earlier versions, when emacs wasn't found, elisp files were not
installed at all.  Using latest CVS, they are written into /.

(Hopefully the error is genuine, but it might be caused by a bad
automake CVS installation.  Mixing autoconf/automake/libtool releases
on a system appear to be somewhat unreliable.)

checking for emacs... no
checking for xemacs... no
...
/bin/sh ../mkinstalldirs /tmp/jas/bin
  /bin/sh ../libtool --mode=install /usr/bin/install -c idn /tmp/jas/bin/idn
/usr/bin/install -c .libs/idn /tmp/jas/bin/idn
/bin/sh ../mkinstalldirs 
 /usr/bin/install -c -m 644 punycode.el /punycode.el
install: /punycode.el: open: Permission denied
...