Set RPM_BUILD_CPUS earlier
When kernel source RPMs are built, a script runs the following:
rpm --eval %{_smp_mflags}
That returns the total number of CPUs on the system, not in the
container. Instead, set the RPM_BUILD_NCPUS
environment variable
earlier so that it is obeyed when creating the source RPM.
Signed-off-by: Major Hayden major@redhat.com