configure: also check for install

We also need the GNU variant for this one.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
(transplanted from 0dfc9c1fcb348e354edc37aacd2e8dcb223e9ab2)

reporter_name="Gustavo Zacarias <gustavo@zacarias.com.ar>"

reporter_url="http://sourceware.org/ml/crossgcc/2011-03/msg00028.html"

reporter_comment=""