pkgdep/pkg: Install llvm-devel

It provides LLVMgold plugin libraries needed by the ld.gold for the
LTO build.

Signed-off-by: Michal Berger <michalx.berger@intel.com>
Change-Id: I7686244278d19c6137661ef93eb70737dc8b6006
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10258


Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Monica Kenguva <monica.kenguva@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>