xcbuild: Get rid of developer.nix, move to wrapper

also:

- add custom outputs "specs" for xcbuild
- get rid of unneeded tools
- update xcbuild
- add more comments
- fixup xcbuild derivations

Affected xcbuild derivations include:

- adv_cmds
- network_cmds
- basic_cmds

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

@@ -3,6 +3,14 @@
 appleDerivation rec {
   buildInputs = [ xcbuild ];
 
+  # These PBXcp calls should be patched in xcbuild to allow them to
+  # automatically be prefixed.
+  patchPhase = ''
+    substituteInPlace basic_cmds.xcodeproj/project.pbxproj \
+      --replace "dstPath = /usr/share/man/man1;" "dstPath = $out/share/man/man1;" \
+      --replace "dstPath = /usr/share/man/man5;" "dstPath = $out/share/man/man5;"
+  '';
+
   # temporary install phase until xcodebuild has "install" support
   installPhase = ''
     mkdir -p $out/bin/
@@ -12,7 +20,6 @@ appleDerivation rec {
       mkdir -p $out/share/man/man$n
       install */*.$n $out/share/man/man$n
     done
-
   '';
 
   meta = {