Merge "Fix make warning/error colors on Mac" am: a46695c3

## Use echo-(warning|error) in a build rule

## Use pretty-(warning|error) instead of $(warning)/$(error)

###########################################################

ESC_BOLD := \e[1m

ESC_WARNING := \e[35m

ESC_ERROR := \e[31m

ESC_RESET := \e[0m

ESC_BOLD := \033[1m

ESC_WARNING := \033[35m

ESC_ERROR := \033[31m

ESC_RESET := \033[0m

# $(1): path (and optionally line) information

# $(2): message to print