[PATCH] configure: Silence shift warning in version_ge()

[Philippe Mathieu-Daudé]

As we might expect less than 2 argument, only shift again
if there is arguments to shift.

This fixes:

    ../configure: line 232: shift: shift count out of range

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 4e5fe332110..cf044ad2d25 100755
--- a/configure
+++ b/configure
@@ -229,7 +229,7 @@ version_ge () {
         set x $local_ver1
         local_first=${2-0}
         # shift 2 does nothing if there are less than 2 arguments
-        shift; shift
+        shift || shift
         local_ver1=$*
         set x $local_ver2
         # the second argument finished, the first must be greater or equal
-- 
2.26.2