[openal-soft] Incorrect prefix in .pc file

[s0600204]

Current problem
The prefix line written to the openal.pc file is incorrect. It currently looks something like:

prefix=D:/a/0ad/0ad/libraries/win32-build/vcpkg/vc/packages/openal-soft_x86-windows

(Exact text will differ depending on triplet, and the location of where vcpkg is building things.)

Proposed solution
Based on other .pc files exported by vcpkg, it should read:

prefix=${pcfiledir}/../..

Describe alternatives you've considered
I'm currently employing a workaround (search-replace of text) in a project that relies on .pc files. Would like to remove that workaround if possible.

[NancyLi1013]

Hi @s0600204

Thanks for posting this issue.

Needs to add vcpkg_fixup_pkgconfig() to fix the paths in .pc files. I will submit a PR to fix this later.