package/micropython: fix segfault at exit() with gcc >= 14

Since Buildroot commit [1] "update to Bootlin toolchains 2025.08-1",
the TestMicroPython segfault when testing if micropython can return a
non-zero exit code.

   micropython -c "import sys ; sys.exit(123)"

This issue is related to the gcc version used to build micropython
(gcc 14 or newer). Using gcc 13 (like Bootlin toolchain 2024.05-1
previously used) micropython run without issue.

The issue has been reported upstream [2] and fixed in newer micropython
releases [3]. For now, apply a temporary workaround (suggested in the
bug report) using -DMICROPY_NLR_SETJMP=1 only for gcc 14 or newer.
MICROPY_NLR_SETJMP avoid the architecture specific implementation of
nlr_push.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/11176774762 (TestMicroPython)

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/947dbc92a20c5acea7882166cae7893e6ea661e1
[2] https://github.com/micropython/micropython/issues/14115
[3] https://github.com/micropython/micropython/commit/35f3f0a87db2580041dd0f7dfd4361df48887796

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 50bc5aa17b)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/micropython/micropython.mk

@@ -29,6 +29,13 @@ ifeq ($(BR2_xtensa),y)
 MICROPYTHON_CFLAGS = -DMICROPY_NLR_SETJMP=1
 endif
 
+# https://github.com/micropython/micropython/issues/14115
+# Temporary fix for GCC 14 compatibility, should be removed after updating to
+# 1.23.0 or later.
+ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_14),y)
+MICROPYTHON_CFLAGS += -DMICROPY_NLR_SETJMP=1
+endif
+
 # When building from a tarball we don't have some of the dependencies that are in
 # the git repository as submodules
 MICROPYTHON_MAKE_OPTS += \