Protect common/zlib/configure parameter processing against infinite loop


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2430 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/zlib/configure b/common/zlib/configure
index e894235..7c66e10 100755
--- a/common/zlib/configure
+++ b/common/zlib/configure
@@ -50,6 +50,7 @@
     -l* | --l*) libdir="$2"; shift; shift;;
     -i* | --i*) includedir="$2"; shift; shift;;
     -s* | --s*) shared=1; shift;;
+    *) shift;;
     esac
 done