[PATCH libgpg-error] build: Fix cross-compiling into a separate build dir.

[NIIBE Yutaka]

Hello,

David Michael wrote:
> I tried to cross-compile libgpg-error-1.38 configured in a separate
> directory, and it fails at two points.  First, it can't redirect output
> to src/lock-obj-pub.native.h because src doesn't exist.  Second, the
> script gen-lock-obj.sh was not included in the release archive.

That's my fault.  Indeed, those two are needed.

I applied your change and pushed it to master.

Thank you.
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