Bump buildroot to 2019.02

bsp/buildroot/package/micropython/Config.in

@@ -2,8 +2,6 @@ config BR2_PACKAGE_MICROPYTHON
 	bool "micropython"
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_STATIC_LIBS
-	# libffi doesn't provide the closure implementation on Blackfin
-	depends on !BR2_bfin
 	select BR2_PACKAGE_LIBFFI
 	help
 	  Micro Python is a lean and fast implementation of the Python
@@ -14,4 +12,3 @@ config BR2_PACKAGE_MICROPYTHON
 
 comment "micropython needs a toolchain w/ threads, dynamic library"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
-	depends on !BR2_bfin

bsp/buildroot/package/micropython/micropython.hash

@@ -1,2 +1,2 @@
 #locally computed
-sha256 55dd751c4c812809841fd06f4729b8341171c4b6c1dc28a9412455282554f8a5  micropython-v1.8.7.tar.gz
+sha256 9a66205d0ba3dff6dcc98119f104cd59c15855c6c030a190ca02354be52836c1  micropython-v1.9.4.tar.gz

bsp/buildroot/package/micropython/micropython.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MICROPYTHON_VERSION = v1.8.7
+MICROPYTHON_VERSION = v1.9.4
 MICROPYTHON_SITE = $(call github,micropython,micropython,$(MICROPYTHON_VERSION))
 MICROPYTHON_LICENSE = MIT
 MICROPYTHON_LICENSE_FILES = LICENSE
@@ -22,14 +22,15 @@ MICROPYTHON_MAKE_OPTS = MICROPY_PY_BTREE=0
 MICROPYTHON_MAKE_OPTS += MICROPY_PY_USSL=0
 
 define MICROPYTHON_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/unix \
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/mpy-cross
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/ports/unix \
 		$(MICROPYTHON_MAKE_OPTS) \
 		CROSS_COMPILE=$(TARGET_CROSS) \
 		CFLAGS_EXTRA=$(MICROPYTHON_CFLAGS)
 endef
 
 define MICROPYTHON_INSTALL_TARGET_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/unix \
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/ports/unix \
 		$(MICROPYTHON_MAKE_OPTS) \
 		CROSS_COMPILE=$(TARGET_CROSS) \
 		CFLAGS_EXTRA=$(MICROPYTHON_CFLAGS) \