[vamp-sdk] install pkgconfig files

[Adela0814]

Fix #22653

install pkgconfig file:

vamp.pc
vamp-hostsdk.pc
vamp-sdk.pc

[github-actions]

You have modified or added at least one vcpkg.json where a "license" field is missing.

If you feel able to do so, please consider adding a "license" field to the following files:

• ports/vamp-sdk/vcpkg.json

Valid values for the license field can be found in the documentation

[ras0219-msft]

Thanks for the PR!

[github-actions]

You have modified or added at least one vcpkg.json where a "license" field is missing.

If you feel able to do so, please consider adding a "license" field to the following files:

• ports/vamp-sdk/vcpkg.json

Valid values for the license field can be found in the documentation

[dg0yt]

Does vamp-hostsdk.pc provide useful information given vcpkg's split of host triplet and target triplet?

[Adela0814]

@dg0yt They are different libraries and has different sources.

[dg0yt]

@dg0yt They are different libraries and has different sources.

Sure. But it doesn't invalidate my question. I could rephrase:
Does vamp-hostsdk.pc relate to tools or libs to be used on the host?

[JackBoosY]

@dg0yt Nope, their add_library are unconditional.

[Be-ing]

Does vamp-hostsdk.pc relate to tools or libs to be used on the host?

"Host" in this context means an application that hosts plugins. It is unrelated to vcpkg's term "host".