py/mkenv.mk: Don't emit info about BUILD_VERBOSE if it's set.

If the user sets V or BUILD_VERBOSE then they don't need to see this
message.

Signed-off-by: Damien George <damien@micropython.org>

py/mkenv.mk

@@ -20,6 +20,7 @@ ifeq ("$(origin V)", "command line")
 BUILD_VERBOSE=$(V)
 endif
 ifndef BUILD_VERBOSE
+$(info Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.)
 BUILD_VERBOSE = 0
 endif
 ifeq ($(BUILD_VERBOSE),0)
@@ -27,10 +28,6 @@ Q = @
 else
 Q =
 endif
-# Since this is a new feature, advertise it
-ifeq ($(BUILD_VERBOSE),0)
-$(info Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.)
-endif
 
 # default settings; can be overridden in main Makefile