[PATCH iproute2] configure: restore backward compatibility

From: Luca Boccassi <redacted>

Commit a9c3d70d902a0473ee5c13336317006a52ce8242 broke backward compatibility
by making 'configure' error out if parameters are passed, instead of
ignoring them.
Sometimes packaging systems detect 'configure' and assume it's from
autotools, and pass a bunch of options. Eg:

 dh_auto_configure
	./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=${prefix}/lib/x86_64-linux-gnu --runstatedir=/run --disable-maintainer-mode --disable-dependency-tracking

Ignore unknown options again instead of erroring out.

Fixes: a9c3d70d902a ("configure: add options ability")

Signed-off-by: Luca Boccassi <redacted>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 0a4a0fc9..7f4f3bd9 100755
--- a/configure
+++ b/configure

@@ -518,7 +518,7 @@ else
 			"")
 				break ;;
 			*)
-				usage 1 ;;
+				shift 1 ;;
 		esac
 	done
 fi

-- 
2.33.0