cross-build/Make: Update cross build to properly forward ARCH and
TARGETS_TO_BUILD variables to build tools submake, and also tweak echo command
to indicate when we are compiling/etc build tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144419 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile b/Makefile
index cc47f0d..f2044fa 100644
--- a/Makefile
+++ b/Makefile
@@ -126,6 +126,8 @@
 	 $(MAKE) -C BuildTools \
 	  BUILD_DIRS_ONLY=1 \
 	  UNIVERSAL= \
+	  ARCH="$(ARCH)" \
+	  TARGETS_TO_BUILD="$(TARGETS_TO_BUILD)" \
 	  ENABLE_OPTIMIZED=$(ENABLE_OPTIMIZED) \
 	  ENABLE_PROFILING=$(ENABLE_PROFILING) \
 	  ENABLE_COVERAGE=$(ENABLE_COVERAGE) \