Windows CMake directory install fix

[themarpe]

Hi @yhirose @sum01

Thanks for your initial work on #470

There is a comment which seems to be the rational behind the different CMake installation directory, but I don't think it is relevant (issue: #287)

I therefore assume that this initial split in installation directory was done "from spec", not from practical issue bubbling up - but it's not (was not) correct.

Proposed are two commits.

1. First one fixes the original behavior - it was close, but that means of searching for CMake config files was only introduced in CMake version 3.25, predating the date of original PR. See: https://cmake.org/cmake/help/latest/command/find_package.html#id3
2. Simplification, which removes the differentiation altogether, and settles for lib/cmake/[project]/ path - I've integrated many CMake dependencies to date in various projects (one bigger being https://github.com/luxonis/depthai-core) and have never seen this installation path used by any dependency on Windows. Never had issues before.

Issue popped up during integration of the library using Hunter package manager.

[sum01]

That distinction was born from my experience trying to get Cmake to find installed things on Windows. Admitedly it was something from a while ago, so maybe it changed by now.

Though I don't think I can really depend on Cmake v3.25 this early. I usually use slower releases like Ubuntu (v3.22) or Debian (v3.18) as a barometer. But if you say it works, I'll plan on testing it on Windows then, although I'd want it to work with the declared minimum Cmake version (v3.14 currently).

[themarpe]

Though I don't think I can really depend on Cmake v3.25 this early. I usually use slower releases like Ubuntu (v3.22) or Debian (v3.18) as a barometer.

I agree, this is what the first commit addresses. The current state is cmake/[package]/ which is a 3.25 feature (as linked), the commit changing it to: cmake/ is pre 3.25, which is what i think you intended in the first place

But if you say it works, I'll plan on testing it on Windows then, although I'd want it to work with the declared minimum Cmake version (v3.14 currently).

Great, do let me know, the latter commit (simplifyed one) is the one I'm in favor of if it works as expected in various cases.

[yhirose]

Thanks for the contribution!