darwin.xnu: provide additional headers needed by Libsystem

pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix

@@ -116,6 +116,9 @@ appleDerivation' (if headersOnly then stdenvNoCC else stdenv) (
     cp EXTERNAL_HEADERS/Availability*.h $out/System/Library/Frameworks/Kernel.framework/Versions/A/Headers/
     cp -r EXTERNAL_HEADERS/corecrypto $out/include
 
+    # These headers are needed by Libsystem.
+    cp libsyscall/wrappers/{spawn/spawn.h,libproc/libproc.h} $out/include
+
     # Build the mach headers we crave
     export SRCROOT=$PWD/libsyscall
     export DERIVED_SOURCES_DIR=$out/include

pkgs/os-specific/darwin/apple-source-releases/xnu/headers-arm64.txt

@@ -637,6 +637,7 @@ libkern/os/reason_private.h
 libkern/os/refcnt.h
 libkern/os/refcnt_internal.h
 libkern/os/trace.h
+libproc.h
 mach/arm/_structs.h
 mach/arm/asm.h
 mach/arm/boolean.h
@@ -1270,6 +1271,7 @@ servers/ls_defs.h
 servers/netname.h
 servers/netname_defs.h
 servers/nm_defs.h
+spawn.h
 sys/_endian.h
 sys/_posix_availability.h
 sys/_select.h

pkgs/os-specific/darwin/apple-source-releases/xnu/headers-x86_64.txt

@@ -554,6 +554,7 @@ libkern/os/object.h
 libkern/os/object_private.h
 libkern/os/overflow.h
 libkern/os/trace.h
+libproc.h
 mach/audit_triggers.defs
 mach/boolean.h
 mach/bootstrap.h
@@ -1116,6 +1117,7 @@ servers/ls_defs.h
 servers/netname.h
 servers/netname_defs.h
 servers/nm_defs.h
+spawn.h
 sys/_endian.h
 sys/_posix_availability.h
 sys/_select.h