Bug 1294331 - Don't enable sandboxing outside of x86/x86_64. r=glandium

MozReview-Commit-ID: Jc0OpFwznVY

--HG--
extra : rebase_source : d0c7a84a8b4440973c6fb315a3171db9aca2bc2b

old-configure.in

@@ -4244,7 +4244,11 @@ Darwin:1)
     MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
     ;;
 Linux:1)
-    MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
+    case $CPU_ARCH in
+        x86_64|x86)
+            MOZ_CONTENT_SANDBOX=$MOZ_SANDBOX
+        ;;
+    esac
     ;;
 esac