[GENX] Directly build libGenISAIntrinsics library from IGC submodule

[pengtu]

Is your feature request related to a problem? Please describe
GENX currently uses a prebuilt libGenISA library binary hard to automate build.

Describe the solution you would like
We can add an IGC submodule to build the library directly in the GENX Make script.

We can start with https://github.com/pengtu/intel-graphics-compiler, which contains updates to LLVM 18 opaque pointers. Later on, we shall use https://github.com/intel/intel-graphics-compiler directly.