Don't require --without-simd to be specified on non-x86 architectures, and fix 'make test' on such architectures


git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@211 632fc199-4ca6-4c93-a231-07263d6284db
diff --git a/configure.ac b/configure.ac
index d85cbcd..bad04ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -145,7 +145,8 @@
     ;;
     *)
       AC_MSG_RESULT([no ("$host_cpu")])
-      AC_MSG_ERROR([CPU is not supported])
+      AC_MSG_WARN([SIMD support not available for this CPU.  Performance will suffer.])
+      with_simd=no;
     ;;
   esac