cross-pkg-config support

Hello,

Looks like crosstool-ng doesn't support a cross-pkg-config wrapper
script. (Unless I am missing it).

Is this something that sounds reasonable to support?
I assume it'll look something like this.
https://github.com/raspberrypi/tools/blob/master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-pkg-config

I believe the last line...
exec "$0-real" "$@"
could be replaced with...
exec pkg-config "$@"
Then we will not need a pkg-config-real binary.

Thoughts on this?

Thanks,
Justin