Fix custom unofficial build tags

Before: CM_VERSION=11-20131217-UNOFFICIAL"-LegacyXperia"-smultron
After:  CM_VERSION=11-20131217-UNOFFICIAL-LegacyXperia-smultron

Change-Id: Ib9c58b39efc4dc5a51380c647db9f7896e165704

Conflicts:
	config/common.mk