cmake: remove CMP0194 policy to restore MSVC builds (llama/21934)

cmake: remove CMP0194 policy to restore MSVC builds (llama/21934)

#21630 added the CMP0194 NEW policy to silence a CMake warning, but on Windows runners it caused CMake to prefer the MinGW toolchain for ASM and broke MSVC builds.

Reverting only that policy block restores the previous working behavior. The CMake 4.1+ warning comes back, but that is cosmetic and does not break any platform.

Reported-by: oobabooga
Refs: #21630

Co-authored-by: texasich <redacted>