community/mold: use llvm17
on 3.19 builders it fails to use clang16 (no longer default)
CMake Error at /usr/share/cmake/Modules/CMakeDetermineCCompiler.cmake:49 (message):
Could not find compiler set in environment variable CC:
clang.
Call Stack (most recent call first):
CMakeLists.txt:47 (project)
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
>>> ERROR: mold: build failed
Edited by Andy Postnikov