common: Disable multithreaded dextop on RELEASE and SNAPSHOT builds

This needs some more work before it can be considered stable enough
for use on these builds.

Change-Id: Ic80603cc59623da878875e40de92bda5caef3331
Merge branch 'cm-11.0' into kk_mkt

Conflicts:
	config/common.mk

Change-Id: I3dd1a22177691ce74c95f4e6f572bcd26ed685be
fix

Change-Id: I8239937927a05636741d51a74c568cdfaa174a32