Merge "core: support make 4.00"

# Check for broken versions of make.

# (Allow any version under Cygwin since we don't actually build the platform there.)

ifeq (,$(findstring CYGWIN,$(shell uname -sm)))

ifeq (0,$(shell expr $$(echo $(MAKE_VERSION) | sed "s/[^0-9\.].*//") = 3.81))

ifeq (0,$(shell expr $$(echo $(MAKE_VERSION) | sed "s/[^0-9\.].*//") = 3.82))

ifneq (1,$(strip $(shell expr $(MAKE_VERSION) \>= 3.81)))

$(warning ********************************************************************************)

$(warning *  You are using version $(MAKE_VERSION) of make.)

$(warning *  Android can only be built by versions 3.81 and 3.82.)

$(warning *  Android can only be built by versions 3.81 and higher.)

$(warning *  see https://source.android.com/source/download.html)

$(warning ********************************************************************************)

$(error stopping)

endif

endif

endif

# Absolute path of the present working direcotry.

# This overrides the shell variable $PWD, which does not necessarily points to