waf: use wafConfigureFlags for waf flags

This avoids the potential conflict between autoconf flags and the waf
flags. There is some overlap between the two but waf errors when it
doesn’t recognize the flag.

pkgs/misc/jackaudio/default.nix

@@ -56,7 +56,7 @@ stdenv.mkDerivation rec {
     export NIX_CFLAGS_COMPILE="-F${CoreFoundation}/Library/Frameworks $NIX_CFLAGS_COMPILE"
   '';
 
-  configureFlags = [
+  wafConfigureFlags = [
     "--classic"
     "--autostart=${if (optDbus != null) then "dbus" else "classic"}"
   ] ++ optional (optDbus != null) "--dbus"