Bazel: Remove GWT from gerrit target
Bazel: Remove GWT from gerrit target

GWT is going to be removed in next gerrit releases, and it is already
removed from gerrit-review. To not waste too much developers time we
remove GWT from `bazel build gerrit`. release.war is not affected
by this change.

Change-Id: I9b92194c61ac0b6cd80f4d5b07e2dba0b74b950a

WANdisco/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit