msgpack: rename from libmsgpack

The project does not use the name "libmsgpack". It variously uses "msgpack" and
"msgpack-c", and "msgpackc" for the name of the library.

pkgs/development/libraries/libtoxcore/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, libsodium, ncurses, libopus, libmsgpack
+{ stdenv, fetchFromGitHub, cmake, libsodium, ncurses, libopus, msgpack
 , libvpx, check, libconfig, pkgconfig }:
 
 let
@@ -20,7 +20,7 @@ let
     ];
 
     buildInputs = [
-      libsodium libmsgpack ncurses libconfig
+      libsodium msgpack ncurses libconfig
     ] ++ stdenv.lib.optionals (!stdenv.isAarch32) [
       libopus libvpx
     ];

pkgs/development/libraries/msgpack/generic.nix

@@ -5,7 +5,7 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "libmsgpack-${version}";
+  name = "msgpack-${version}";
 
   inherit src patches;
 

pkgs/development/libraries/opendht/default.nix

@@ -6,7 +6,7 @@
 , pkgconfig
 , nettle
 , gnutls
-, libmsgpack
+, msgpack
 , readline
 , libargon2
 }:
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     pkgconfig
     nettle
     gnutls
-    libmsgpack
+    msgpack
     readline
     libargon2
   ];

pkgs/development/ruby-modules/gem-config/default.nix

@@ -21,7 +21,7 @@
 , libiconv, postgresql, v8_3_16_14, clang, sqlite, zlib, imagemagick
 , pkgconfig , ncurses, xapian_1_2_22, gpgme, utillinux, fetchpatch, tzdata, icu, libffi
 , cmake, libssh2, openssl, mysql, darwin, git, perl, pcre, gecode_3, curl
-, libmsgpack, qt48, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
+, msgpack, qt48, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, buildRubyGem
 , cairo, re2, rake, gobjectIntrospection, gdk_pixbuf, zeromq, graphicsmagick, libcxx
 }@args:
 
@@ -219,7 +219,7 @@ in
   };
 
   msgpack = attrs: {
-    buildInputs = [ libmsgpack ];
+    buildInputs = [ msgpack ];
   };
 
   mysql = attrs: {