Make USE_NINJA=true the default

Build with kati + ninja by default, unless specifically disabled with
USE_NINJA=false in the environment or on the make command line.

Bug: 23565895
Change-Id: I1fa9f5c6eb4d4ed3f5b81454f89d19fd2f1f6abb

parent 3ee9daac

core/main.mk

+1 −1

Original line number	Diff line number	Diff line
		@@ -92,7 +92,7 @@ include $(BUILD_SYSTEM)/help.mk
		# and host information.
		include $(BUILD_SYSTEM)/config.mk

		ifeq ($(USE_NINJA),true)
		ifneq ($(USE_NINJA),false)
		# Mark this is a ninja build.
		$(shell mkdir -p $(OUT_DIR) && touch $(OUT_DIR)/ninja_build)
		include build/core/ninja.mk