feat: fixed server comp, added ELF inject

I gave up and just put it in a Docker image, it's not as important as
the beacons being statically compiled

system-libs.nix

@@ -1,4 +1,5 @@
-{ pkgs, libnl-src, libpcap-src, winpcap-installer, freebsd-libs-packed }:
+{ pkgs, libcap-src, libnl-src, libpcap-src, winpcap-installer
+, freebsd-libs-packed }:
 let
   freebsd-libs = pkgs.stdenv.mkDerivation {
     name = "freebsd-libs";
@@ -81,6 +82,26 @@ in {
     '';
   };
 
+  libcap = pkgs.stdenv.mkDerivation {
+    name = "libcap-static";
+
+    nativeBuildInputs = with pkgs; [ clang musl ];
+
+    src = libcap-src;
+
+    buildPhase = ''
+      export BUILD_CC=musl-clang
+      export CC=musl-gcc
+      export CXX=musl-gcc
+      make -C libcap
+    '';
+
+    installPhase = ''
+      mkdir -p $out/lib
+      cp -a libcap/* $out/lib
+    '';
+  };
+
   libpcap-linux-gnu = pkgs.stdenv.mkDerivation {
     name = "libpcap-static-linux-gnu";