native cmake fixes + add native llvm 14

[th0ma7]

Description

1. Noticed issues with native cmake building
2. Adding native llvm 14 - This is to be used as pre-compiled released on spksrc for fastening the IGC build from Enable opencl on ffmpeg5-6 with DSM >= 7 #6166

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package functionality was tested
• Any needed documentation is updated/created

Type of change

• Bug fix
• New Package
• Package update
• Includes small framework changes
• This change requires a documentation update (e.g. Wiki)

[th0ma7]

@hgy59 would you have cycles to test building the native llvm-14 and generate a resulting package similar to llvm-9.0 along with related native/llvm-14.0.

I'm finally inches away from enabling opencl on ffmpeg x64 builds, but similar to llvm-9.0 I require NATIVE clang|llvm-tlbgen binaries matching the built version, thus this addition into native.

Thnx in advance!

[th0ma7]

@hgy59 friendly reminder when you have a moment to build a llvm-14 package to be re-used, thnx.

[hgy59]

@hgy59 friendly reminder when you have a moment to build a llvm-14 package to be re-used, thnx.

@th0ma7 you find the build as https://github.com/SynoCommunity/spksrc/releases/download/native%2Fllvm/native-llvm-14.0.5.tar.gz

Unfortunately there is no build log file created for native packages. So I have not a clue about build warnings...

[th0ma7]

@hgy59 friendly reminder when you have a moment to build a llvm-14 package to be re-used, thnx.

@th0ma7 you find the build as https://github.com/SynoCommunity/spksrc/releases/download/native%2Fllvm/native-llvm-14.0.5.tar.gz

Unfortunately there is no build log file created for native packages. So I have not a clue about build warnings...

Indeed that's something we should add. Interestingly, when launched from an spk build logs does get generated btw...

[th0ma7]

@hgy59 I just captured that the file is now available (thnx a lot!) although I can't find it in our release page?
https://github.com/SynoCommunity/spksrc/releases

[th0ma7]

Don't bother, I just found it out at https://github.com/SynoCommunity/spksrc/releases/tag/native%2Fllvm
Again thnx.

[th0ma7]

@hgy59 if you have a moment for a quick review, considering your commit addition I presume it to be all ok.