[Buildroot] [PATCHv2] micropython: Invert fallback detection logic

[Chris Packham <judge.packham@gmail.com>]

Rather than specifying architectures that do not have explicit support
in micropython invert the logic and set MICROPY_GCREGS_SETJMP=1 if the
architecture does not have explicit support. MIPS is listed as being
supported but this support consists of automatically defining
MICROPY_GCREGS_SETJMP 1 based on __mips__ being defined.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
---
This should clean up most of the remaining build failures. Listing the
architectures with explicit support makes more sense to me and is
certainly a shorter list at the moment.
    
Changes since v1:
- Use positive logic ifeq(,) instead of ifneq(,y)

 package/micropython/micropython.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/micropython/micropython.mk b/package/micropython/micropython.mk
index f2ad5bf..f8f1e80 100644
--- a/package/micropython/micropython.mk
+++ b/package/micropython/micropython.mk
@@ -13,7 +13,7 @@ MICROPYTHON_PATCH = https://github.com/micropython/micropython/commit/8b4fb4fe14
 
 # Use fallback implementation for exception handling on architectures that don't
 # have explicit support.
-ifeq ($(BR2_powerpc)$(BR2_sh)$(BR2_xtensa),y)
+ifeq ($(BR2_i386)$(BR2_x86_64)$(BR2_arm)$(BR2_armeb),)
 MICROPYTHON_CFLAGS = -DMICROPY_GCREGS_SETJMP=1
 endif
 
-- 
2.5.0