[Buildroot] [PATCHv2] micropython: fix build for MIPS64 n32

[Vicente Olivert Riera]

This patch applies an upstream patch to fix a compile error like this
one:

modffi.c: In function 'ffifunc_call':
modffi.c:358:25: error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]
             values[i] = (ffi_arg)a;

This error can be highlighted when building micropython for MIPS64 n32
because ffi_arg is 64-bit wide and the pointers on MIPS64 n32 are 32-bit
wide, so it's trying to case an integer to a pointer (or vice versa) of
a different size. We should cast first the pointer (or the integer) to a
pointer sized integer (intptr_t) to fix that problem.

This patch was merged upstream as a result of this pull request:

  https://github.com/micropython/micropython/pull/1471

Fixes:

  http://autobuild.buildroot.net/results/e22/e2253de3f96e9a53e75b4cecaf56c1df2950803f/

Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
---
Changes v1 - > v2:
  - Fixed a typo in the commit log: changed 'from' to 'for'
  - Add the patch file to MICROPYTHON_PATCH using '+='. (Chris Packham)

 package/micropython/micropython.mk |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/package/micropython/micropython.mk b/package/micropython/micropython.mk
index f2ad5bf..7f401bf 100644
--- a/package/micropython/micropython.mk
+++ b/package/micropython/micropython.mk
@@ -10,6 +10,7 @@ MICROPYTHON_LICENSE = MIT
 MICROPYTHON_LICENSE_FILES = LICENSE
 MICROPYTHON_DEPENDENCIES = host-pkgconf libffi
 MICROPYTHON_PATCH = https://github.com/micropython/micropython/commit/8b4fb4fe140e9cf57fcfa258d0d2d6fe19090fc5.patch
+MICROPYTHON_PATCH += https://github.com/micropython/micropython/commit/587914169cc6ff7f0513bd14c42dcbb275bf77bd.patch
 
 # Use fallback implementation for exception handling on architectures that don't
 # have explicit support.
-- 
1.7.1