[Feature] Add system searching for WebP

[Hex4dec]

GZDoom version

CMakeLists.txt from g14.12.2

Which game are you running with GZDoom?

None

What Operating System are you using?

None

If Other OS, please describe

No response

Relevant hardware info

No response

Is your feature request related to a problem? Please describe.

There is no FORCE_INTERNAL_WEBP or for that matter, any system searching for the webp library.

Describe the solution you'd like

It would be nice if there would be a FORCE_INTERNAL_WEBP flag I could disable so I can use the system WebP library. I trust my package manager more than GZDoom.

Describe alternatives you've considered

No response

Add any other context or screenshots about the feature request here.

No response

[RicardoLuis0]

pretty sure you can revert these 3 commits to make it use the system libraries:
26fe8f0
648b1a1
140ad88

[RicardoLuis0]

(i'll also add it to cmake, but will take a bit of testing/time)

[Hex4dec]

The reason for it being internal-only (or even internal-optional) is quite ridiculous. Package managers are supposed to do their job and you shouldn't worry about it. If vcpkg's package "breaks overnight", you shouldn't touch it and instead yell at vcpkg's maintainers to fix it.

Anyway, thank you.

[RicardoLuis0]

the reason for using vcpkg was to simplify package management on windows, since vcpkg broke, vcpkg was removed and the library was embedded

[coelckers]

Note: If you revert those 3 commits you void your warranty.

Of course we could change it, but why should we make things harder for us by haviing to deal with third party induced problems?

[Hex4dec]

Like it isn't already voided by the GPL, ha