vpcs: 0.8 -> 0.8.1

Thanks to Repology / Alpine Linux I noticed that the GNS3 team continued
the development. From their README:
> This is a continuation of VPCS, based on the last development version
> and improved with patches wrote by various people from the community.
> The original VPCS code, which is unfortunately not maintained anymore,
> can be viewed on https://sourceforge.net/p/vpcs/code/

pkgs/applications/virtualization/vpcs/default.nix

@@ -1,19 +1,16 @@
-{ stdenv, fetchurl, glibc }:
+{ stdenv, fetchFromGitHub }:
 
 stdenv.mkDerivation rec {
   pname = "vpcs";
-  version = "0.8";
+  version = "0.8.1";
 
-  src = fetchurl {
+  src = fetchFromGitHub {
-    name = "${pname}-${version}.tar.bz2";
+    owner = "GNS3";
-    url = "mirror://sourceforge/project/${pname}/${version}/${pname}-${version}-src.tbz";
+    repo = pname;
-    sha256 = "14y9nflcyq486vvw0na0fkfmg5dac004qb332v4m5a0vaz8059nw";
+    rev = "v${version}";
+    sha256 = "0kqy4bd3ns8nzn7fa72izn7a08sfrasy1rn7fd8ajah2wv8d2cak";
   };
 
-  patches = [ ./vpcs-0.8-glibc-2.26.patch ];
-
-  buildInputs = [ glibc.static ];
-
   buildPhase = ''(
     cd src
     ./mk.sh ${stdenv.buildPlatform.platform.kernelArch}
@@ -27,13 +24,13 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   meta = with stdenv.lib; {
-    description = "Virtual PC simulator";
+    description = "A simple virtual PC simulator";
     longDescription = ''
-      The VPCS can simulate up to 9 PCs. You can ping/traceroute them, or
+      The VPCS (Virtual PC Simulator) can simulate up to 9 PCs. You can
-      ping/traceroute the other hosts/routers from the VPCS when you study the
+      ping/traceroute them, or ping/traceroute the other hosts/routers from the
-      Cisco routers in the dynamips.
+      VPCS when you study the Cisco routers in the dynamips.
     '';
-    homepage = "https://sourceforge.net/projects/vpcs/";
+    inherit (src.meta) homepage;
     license = licenses.bsd2;
     platforms = platforms.linux;
     maintainers = with maintainers; [ primeos ];

pkgs/applications/virtualization/vpcs/vpcs-0.8-glibc-2.26.patch

@@ -1,14 +0,0 @@
-diff --git a/src/getopt.h b/src/getopt.h
-index 4394aa2..bf59e10 100644
---- a/src/getopt.h
-+++ b/src/getopt.h
-@@ -49,9 +49,6 @@ extern int optind;
- extern int opterr;
- extern int optopt;
- 
--#ifndef FreeBSD
--int getopt(int argc, char** argv, char* optstr);
--#endif
- int arg_to_int(const char* arg, int min, int max, int defalt);
- 
- #ifdef __cplusplus