darwin.diskdev_cmds: fix build with dsymutil

xcbuild doesn’t handle dsymutil correctly. fuser.pl does not contain
debug symbols, but xcbuild doesn’t handle this like xcodebuild does.
So, just disable the debug information. We probably should do this in
more places using xcbuild, but it requires some arbitrary patching.

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

@@ -18,14 +18,16 @@ appleDerivation {
     cp xnu-*/bsd/i386/disklabel.h i386
     cp -r xnu-*/bsd/sys System
     cp -r Libc-*/uuid System
+    substituteInPlace diskdev_cmds.xcodeproj/project.pbxproj \
+      --replace 'DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";' ""
   '';
   installPhase = ''
     install -D Products/Release/libdisk.a $out/lib/libdisk.a
     rm Products/Release/libdisk.a
     for f in Products/Release/*; do
       if [ -f $f ]; then
-        install -D $file $out/bin/$(basename $f)
-      done
+        install -D $f $out/bin/$(basename $f)
+      fi
     done
   '';