swift-testing: fix _FORTIFY_SOURCE build

`limits.h` must be included before `stdlib.h` when building with glibc and
having `_FORTIFY_SOURCE` set to a non-zero value.

When building with `_FORTIFY_SOURCE`, `realpath()` is inlined, and its
definition depends on whether `limits.h` has been included or not (clearly,
this is a terrible idea in terms of interacting with Clang modules and should
probably be fixed upstream). If the definition differs from the one in
SwiftGlibc, then _TestingInternals will not build.

swiftlang/swift-testing#1184

Author: lhoward

recipes-devtools/swift/swift-testing.bb

@@ -13,6 +13,7 @@ SRCREV_FORMAT = "swift_testing"
 
 SRC_URI = "git://github.com/swiftlang/swift-testing.git;protocol=https;tag=swift-${SWIFT_VERSION}-RELEASE;nobranch=1"
 SRC_URI += "file://0001-build-as-dynamic-library.patch;striplevel=1;"
+SRC_URI += "file://0002-order-limits.h-before-stdlib.h-to-workaround-for-gli.patch;striplevel=1;"
 
 S = "${WORKDIR}/git"
 B = "${WORKDIR}/build"

recipes-devtools/swift/swift-testing/0002-order-limits.h-before-stdlib.h-to-workaround-for-gli.patch

@@ -0,0 +1,42 @@
+From 2ee53c692f781dff38dcbabe819ecfe841841588 Mon Sep 17 00:00:00 2001
+From: Luke Howard <lukeh@padl.com>
+Date: Sat, 28 Jun 2025 16:00:04 +1000
+Subject: [PATCH] order limits.h before stdlib.h to workaround for glibc
+ fortify source issue
+
+limits.h must be included before stdlib.h with glibc, otherwise the fortified
+realpath() in this module's stdlib  will differ from the one in SwiftGlibc.
+---
+ Sources/_TestingInternals/include/Includes.h | 9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/Sources/_TestingInternals/include/Includes.h b/Sources/_TestingInternals/include/Includes.h
+index 1b95151..acc38df 100644
+--- a/Sources/_TestingInternals/include/Includes.h
++++ b/Sources/_TestingInternals/include/Includes.h
+@@ -39,6 +39,11 @@
+ #include <stdbool.h>
+ #include <stdint.h>
+ #include <stdio.h>
++#if __has_include(<limits.h>)
++/// limits.h must be included before stdlib.h with glibc, otherwise the
++/// fortified realpath() in this module will differ from the one in SwiftGlibc.
++#include <limits.h>
++#endif
+ #include <stdlib.h>
+ #include <string.h>
+ #include <time.h>
+@@ -97,10 +102,6 @@
+ #include <pwd.h>
+ #endif
+ 
+-#if __has_include(<limits.h>)
+-#include <limits.h>
+-#endif
+-
+ #if __has_include(<spawn.h>)
+ #include <spawn.h>
+ #endif
+-- 
+2.39.5 (Apple Git-154)
+