ftoastr: use strtof only if HAVE_STRTOF This is needed on HP-UX 11.11 with GCC 4.24; see Bruno Haible's report <http://lists.gnu.org/archive/html/bug-gnulib/2011-06/msg00154.html>. * lib/ftoastr.c (STRTOF) [LENGTH == 1]: Use strtof only if HAVE_STRTOF. * modules/ftoastr (configure.ac): Check for strtof.