ninja: remove impure dependency on /bin/sh

pkgs/by-name/ni/ninja/0001-spawn-sh-instead-of-bin-sh.patch

@@ -0,0 +1,27 @@
+From cf438f7a3ab2e70b06ec12653d1111e35084733f Mon Sep 17 00:00:00 2001
+From: Max <max@privatevoid.net>
+Date: Fri, 8 Aug 2025 18:20:48 +0200
+Subject: [PATCH] spawn sh instead of /bin/sh
+
+---
+ src/subprocess-posix.cc | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/subprocess-posix.cc b/src/subprocess-posix.cc
+index 0e62b3b..c1c31aa 100644
+--- a/src/subprocess-posix.cc
++++ b/src/subprocess-posix.cc
+@@ -129,8 +129,8 @@ bool Subprocess::Start(SubprocessSet* set, const string& command) {
+   if (err != 0)
+     Fatal("posix_spawnattr_setflags: %s", strerror(err));
+ 
+-  const char* spawned_args[] = { "/bin/sh", "-c", command.c_str(), NULL };
+-  err = posix_spawn(&pid_, "/bin/sh", &action, &attr,
++  const char* spawned_args[] = { "sh", "-c", command.c_str(), NULL };
++  err = posix_spawnp(&pid_, "sh", &action, &attr,
+         const_cast<char**>(spawned_args), environ);
+   if (err != 0)
+     Fatal("posix_spawn: %s", strerror(err));
+-- 
+2.50.1
+

pkgs/by-name/ni/ninja/package.nix

@@ -52,8 +52,11 @@ stdenv.mkDerivation (finalAttrs: {
     libxslt.bin
   ];
 
+  patches = [
+    ./0001-spawn-sh-instead-of-bin-sh.patch
+  ]
   # TODO: remove together with ninja 1.11
-  patches = lib.optionals (lib.versionOlder finalAttrs.version "1.12") [
+  ++ lib.optionals (lib.versionOlder finalAttrs.version "1.12") [
     (fetchpatch {
       name = "ninja1.11-python3.13-compat.patch";
       url = "https://github.com/ninja-build/ninja/commit/9cf13cd1ecb7ae649394f4133d121a01e191560b.patch";