mono4: fix build w/glibc-2.30

pkgs/development/compilers/mono/4.nix

@@ -5,4 +5,5 @@ callPackage ./generic.nix ({
   version = "4.8.1.0";
   sha256 = "1vyvp2g28ihcgxgxr8nhzyzdmzicsh5djzk8dk1hj5p5f2k3ijqq";
   enableParallelBuilding = false; # #32386, https://hydra.nixos.org/build/65600645
+  extraPatches = [ ./mono4-glibc.patch ];
 })

pkgs/development/compilers/mono/generic.nix

@@ -1,6 +1,7 @@
 { stdenv, fetchurl, bison, pkgconfig, glib, gettext, perl, libgdiplus, libX11, callPackage, ncurses, zlib, withLLVM ? false, cacert, Foundation, libobjc, python, version, sha256, autoconf, libtool, automake, cmake, which
 , enableParallelBuilding ? true
 , srcArchiveSuffix ? "tar.bz2"
+, extraPatches ? []
 }:
 
 let
@@ -42,7 +43,7 @@ stdenv.mkDerivation rec {
 
   # We want pkg-config to take priority over the dlls in the Mono framework and the GAC
   # because we control pkg-config
-  patches = [ ./pkgconfig-before-gac.patch ];
+  patches = [ ./pkgconfig-before-gac.patch ] ++ extraPatches;
 
   # Patch all the necessary scripts. Also, if we're using LLVM, we fix the default
   # LLVM path to point into the Mono LLVM build, since it's private anyway.

pkgs/development/compilers/mono/mono4-glibc.patch

@@ -0,0 +1,12 @@
+diff --git a/mono/io-layer/processes.c b/mono/io-layer/processes.c
+index 53c271a4..84bd3252 100644
+--- a/mono/io-layer/processes.c
++++ b/mono/io-layer/processes.c
+@@ -19,6 +19,7 @@
+ #include <errno.h>
+ #include <sys/types.h>
+ #include <sys/stat.h>
++#include <sys/sysmacros.h>
+ #include <unistd.h>
+ #ifdef HAVE_SIGNAL_H
+ #include <signal.h>