pthread-man-pages: Remove

As far as I can tell, the man-pages package provides documentation for
every function provided by pthread-man-pages except
pthread_mutexattr_setkind_np, which no longer appears in the Glibc
headers. So let's ditch it.

pkgs/data/documentation/pthread-man-pages/default.nix

···
-/* Pthread man pages from LinuxThreads.
-
-   Some of these pages are superseded by those in the `man-pages'
-   package, but not all.  Like other distros (e.g., Debian's
-   `glibc-doc' package) we take man pages from LinuxThreads so that
-   we can cover pretty much all of pthreads.  */
-
-{ fetchurl, stdenv, perl }:
-
-let version = "2.5";
-in
-  stdenv.mkDerivation rec {
-    name = "pthread-man-pages-${version}";
-
-    src = fetchurl {
-      url = "mirror://gnu/glibc/glibc-linuxthreads-${version}.tar.bz2";
-      sha256 = "0b5xg7ba64d1gbqw4k1qk96qgy7h2y4qksr0qx8v7a14c6xaw9zf";
-    };
-
-    buildInputs = [ perl ];
-
-    unpackPhase = ''
-      echo "unpacking to \`${name}'"
-      mkdir "${name}"
-      cd "${name}"
-      tar xjvf "$src"
-    '';
-
-    patchPhase = ''
-      mkdir -p "$out/share/man/man3"
-
-      sed -i "linuxthreads/man/Makefile" \
-          -e "s|MANDIR *=.*$|MANDIR = $out/share/man/man3| ;
-              s|3thr|3|g"
-    '';
-
-    preConfigure = "cd linuxthreads/man";
-
-    postInstall = ''
-      chmod a-x $out/share/man/man3/*.3
-    '';
-
-    meta = {
-      description = "POSIX threads (pthreads) manual pages from LinuxThreads";
-      homepage = http://www.gnu.org/software/libc/;
-      maintainers = [ stdenv.lib.maintainers.mornfall ];
-    };
-  }

pkgs/top-level/all-packages.nix

···
 
   proggyfonts = callPackage ../data/fonts/proggyfonts { };
 
-  pthreadmanpages = callPackage ../data/documentation/pthread-man-pages {
-    perl = perl516; # syntax error at troffprepro line 49, near "do subst("
-  };
-
   sampradaya = callPackage ../data/fonts/sampradaya { };
 
   shared_mime_info = callPackage ../data/misc/shared-mime-info { };