libctf: use libtool for link test in configure

The configure check for ELF support in BFD uses the AC_TRY_LINK.  If
libbfd's dependencies change, this macro will need to be updated
manually with explicit additions to LDFLAGS and LIBS.

This patch updates the check to use libtool instead.

ChangeLog:

	* libctf/configure.ac: Use libtool instead.
	* libctf/configure: Regenerated.

libctf/configure.ac

@@ -44,6 +44,7 @@ AC_DISABLE_SHARED
 
 LT_INIT
 AC_SYS_LARGEFILE
+LT_OUTPUT
 
 MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
 AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
@@ -83,9 +84,11 @@ AM_CONDITIONAL(ENABLE_LIBCTF_HASH_DEBUGGING, test "${enable_libctf_hash_debuggin
 OLD_CFLAGS=$CFLAGS
 OLD_LDFLAGS=$LDFLAGS
 OLD_LIBS=$LIBS
+OLD_CC=$CC
 # Put the old CFLAGS/LDFLAGS last, in case the user's (C|LD)FLAGS
 # points somewhere with bfd, with -I/foo/lib and -L/foo/lib.  We
 # always want our bfd.
+CC="./libtool --quiet --mode=link $OLD_CC"
 CFLAGS="-I${srcdir}/../include -I../bfd -I${srcdir}/../bfd $CFLAGS"
 ZLIBDIR=`echo $zlibdir | sed 's,\$(top_builddir)/,,g'`
 LDFLAGS="-L../bfd -L../libiberty $ZLIBDIR $LDFLAGS"
@@ -103,6 +106,7 @@ AC_CACHE_CHECK([for ELF support in BFD], ac_cv_libctf_bfd_elf,
 CFLAGS=$OLD_CFLAGS
 LDFLAGS=$OLD_LDFLAGS
 LIBS=$OLD_LIBS
+CC=$OLD_CC
 
 if test $ac_cv_libctf_bfd_elf = yes; then
   AC_DEFINE([HAVE_BFD_ELF], 1,