Print first line of LDD output only.

aclocal.m4

@@ -38,7 +38,7 @@ AC_CACHE_CHECK([for -l$1 soname], ac_cv_lib_soname_$1,
 [ac_get_soname_save_LIBS=$LIBS
 LIBS="-l$1 $3 $LIBS"
   AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
-  [ac_cv_lib_soname_$1=`$ac_cv_path_LDD conftest$ac_exeext | grep lib$1\\.$LIBEXT | sed "s/^.*\(lib$1\.$LIBEXT[[^	 ]]*\).*$/\1/"`
+  [ac_cv_lib_soname_$1=`$ac_cv_path_LDD conftest$ac_exeext | grep lib$1\\.$LIBEXT | sed -e "s/^.*\(lib$1\.$LIBEXT[[^	 ]]*\).*$/\1/"';2,$d'`
   if test "x$ac_cv_lib_soname_$1" = "x"
   then
      ac_cv_lib_soname_$1="lib$1.$LIBEXT"