Reduce number of parallel gcc invocations from 4 to 2 per cpu

Some build hosts can run out of memory during compilation.
This should reduce memory demand without affecting build time.

Change-Id: I11bd2884a1f8885a8a332bbbf0a63324a3079c3b
Signed-off-by: Damjan Marion <damarion@cisco.com>
1 file changed