security/clambc is not jobs safe.

This has failed on me at least twice recently. Here's the last fail:
Assembler messages:
Fatal error: llvm[3]: Compiling Mangler.cpp for Release build
can't create /wrkdirs/security/clambc/work/clamav-bytecode-compiler-

clambc-0.98.5rc1/obj/lib/Target/ClamBC/Release/version.o: No such file
or directory