testing/micropython: disable on x86 and let abuild do strip

It fails to build on x86 with a segfault:

MPY modules/upip.py
make: *** [../../py/mkrules.mk:114: build/frozen_mpy/upip.mpy]
Segmentation fault (core dumped)

testing/micropython/micropython-1.9.4-prevent-stripping.patch

@@ -0,0 +1,22 @@
+--- a/py/mkenv.mk	2017-11-25 09:52:30.921836372 +0000
++++ a/py/mkenv.mk	2017-11-25 09:52:35.257861233 +0000
+@@ -50,7 +50,6 @@
+ LD = $(CROSS_COMPILE)ld
+ OBJCOPY = $(CROSS_COMPILE)objcopy
+ SIZE = $(CROSS_COMPILE)size
+-STRIP = $(CROSS_COMPILE)strip
+ AR = $(CROSS_COMPILE)ar
+ ifeq ($(MICROPY_FORCE_32BIT),1)
+ CC += -m32
+--- a/py/mkrules.mk	2017-11-25 09:53:13.107078063 +0000
++++ a/py/mkrules.mk	2017-11-25 09:53:31.898185592 +0000
+@@ -129,9 +129,6 @@
+ # Do not pass COPT here - it's *C* compiler optimizations. For example,
+ # we may want to compile using Thumb, but link with non-Thumb libc.
+ 	$(Q)$(CC) -o $@ $^ $(LIB) $(LDFLAGS)
+-ifndef DEBUG
+-	$(Q)$(STRIP) $(STRIPFLAGS_EXTRA) $(PROG)
+-endif
+ 	$(Q)$(SIZE) $$(find $(BUILD) -path "$(BUILD)/build/frozen*.o") $(PROG)
+ 
+ clean: clean-prog