Get rid of non-LLVM build configurations

[xddxd]

Get rid of Release - LLVM and Debug - LLVM configurations as per the roadmap on the website. Now Release and Debug act like the LLVM configs. Also, SPIRV and glslang were building in debug mode regardless of the set configuration because the build type was not set in the vcxproj, so fixed that too.

[Nekotekina]

It will probably meet some resistance from devs, although I don't have any objections.

[Megamouse]

no objections either. who gives a f*** about non llvm builds these days. right @clienthax :)

[xddxd]

oops, forgot to push the azure file.

[clienthax]

Not like they have worked in ages lol

[Megamouse]

Release seems to build on VS.
lgtm. (didn't really look at the solution files though)

[elad335]

that's nice and all but the code also needs cleanup with assuming LLVM_AVAILABLE preprocessor is defined.

[Megamouse]

Can't you build without llvm on Linux?

[MSuih]

Yes, but it should be removed too to match windows side.

See the following:
https://github.com/RPCS3/rpcs3/blob/master/CMakeLists.txt#L16
https://github.com/RPCS3/rpcs3/blob/master/3rdparty/llvm.cmake

[Megamouse]

For some reason I can already see some linux guy making a pull request to add it back in

[Nekotekina]

Don't rush, there is also BSD build which doesn't have precompiled binaries and has to use that option.