FYI: Do not shift empty cmdline

[Ralf Wildenhues]

Applied to branch-2-0 and HEAD.

2004-10-30  Ralf Wildenhues <address@hidden>

        * tests/defs.m4sh (func_exec): `shift'ing when there is nothing
        to shift is non-portable.

Index: tests/defs.m4sh
===================================================================
RCS file: /cvsroot/libtool/libtool/tests/defs.m4sh,v
retrieving revision 1.1.2.2
diff -u -r1.1.2.2 defs.m4sh
--- tests/defs.m4sh     7 Oct 2004 02:46:39 -0000       1.1.2.2
+++ tests/defs.m4sh     1 Nov 2004 11:03:47 -0000
@@ -284,7 +284,8 @@
 
     if eval $my_program $my_exp_output; then :
     else
-      shift; shift
+      shift
+      test "x$1" = x || shift
       func_error "$0: cannot execute $my_program address@hidden"
 
       # Simple check to see if they are superuser.