community/mozjs115: use llvm17
Follow-up to !54112 (merged) and llvm/clang upgrade to 17
ATM mozjs fails on builders
0:09.52 checking for xargs... /usr/bin/xargs
0:09.52 checking for rpmbuild... not found
0:09.62 checking for llvm-objdump... not found
0:09.62 DEBUG: llvm_objdump: Looking for llvm-objdump
0:09.62 ERROR: Cannot find llvm-objdump
Config object not found by mach.
*** Fix above errors and then restart with "./mach build"
>>> ERROR: mozjs115: build failed