sys-devel/m4: Sync with Gentoo

It's from Gentoo commit 2f50bca02b84869cd6ac5c2ba6fb5caa05fcb362.

sdk_container/src/third_party/portage-stable/sys-devel/m4/files/m4-1.4.19-race-condition-tests.patch

@@ -0,0 +1,34 @@
+https://lists.gnu.org/archive/html/bug-m4/2022-12/msg00000.html
+https://lists.gnu.org/archive/html/bug-m4/2022-12/txtmGJxjX3osy.txt
+
+Fix a sporadic failure of the test-posix_spawn-script test.
+
+From a3efddb96f5f121b8a5bb1310dc82407546fd255 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Thu, 22 Dec 2022 21:19:34 -0800
+Subject: [PATCH] posix_spawnp-tests: fix filename typo
+
+Problem reported for GNU m4 by Mitchell Dorrell in:
+https://lists.gnu.org/r/bug-m4/2022-12/msg00000.html
+* tests/test-posix_spawnp-script.c (DATA_FILENAME):
+Fix typo in file name that caused race with
+test-posix_spawn-script.c.
+---
+ tests/test-posix_spawnp-script.c | 2 +-
+ 2 files changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/tests/test-posix_spawnp-script.c b/tests/test-posix_spawnp-script.c
+index 1e5fc5c110..d2035ed63e 100644
+--- a/tests/test-posix_spawnp-script.c
++++ b/tests/test-posix_spawnp-script.c
+@@ -28,7 +28,7 @@
+ 
+ #include "macros.h"
+ 
+-#define DATA_FILENAME "test-posix_spawn-script.tmp"
++#define DATA_FILENAME "test-posix_spawnp-script.tmp"
+ 
+ int
+ main ()
+-- 
+2.25.1

sdk_container/src/third_party/portage-stable/sys-devel/m4/m4-1.4.19-r2.ebuild

@@ -41,7 +41,8 @@ PATCHES=(
 	"${FILESDIR}"/loong-fix-build.patch
 	"${FILESDIR}"/${PN}-1.4.19-make-4.4-tests.patch
 	"${WORKDIR}"/${P}-test-198-sysval-r1.patch
-	"${FILESDIR}"/${PN}-1.4.19-fortify-source.patch
+	"${FILESDIR}"/${P}-fortify-source.patch
+	"${FILESDIR}"/${P}-race-condition-tests.patch
 )
 
 src_unpack() {