packaging: stop copying unnecessary boost libraries

Originally, libboost_context and dependent dynamic libraries have been copied
into the nix package to remove boost from the closure and consequently reduce
the closure size. Since commit ef0de7c79f we do
not depend on Boost coroutines any more, so these libraries are not needed at
all any more and (somewhat ironically) only increase the package size. Remove
them.

Change-Id: I6a6a6964dc3e0b29dfad8b2b232b428ba3cc653c

package.nix

@@ -387,30 +387,10 @@ stdenv.mkDerivation (finalAttrs: {
 
   cargoDeps = rustPlatform.importCargoLock { lockFile = ./Cargo.lock; };
 
-  preConfigure =
-    lib.optionalString (!finalAttrs.dontBuild && !hostPlatform.isStatic) ''
-      # Copy libboost_context so we don't get all of Boost in our closure.
-      # https://github.com/NixOS/nixpkgs/issues/45462
-      mkdir -p $out/lib
-      cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
-      rm -f $out/lib/*.a
-    ''
-    + lib.optionalString (!finalAttrs.dontBuild && hostPlatform.isLinux && !hostPlatform.isStatic) ''
-      chmod u+w $out/lib/*.so.*
-      patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
-    ''
-    + lib.optionalString (!finalAttrs.dontBuild && hostPlatform.isDarwin) ''
-      for LIB in $out/lib/*.dylib; do
-        chmod u+w $LIB
-        install_name_tool -id $LIB $LIB
-        install_name_tool -delete_rpath ${boost}/lib/ $LIB || true
-      done
-      install_name_tool -change ${boost}/lib/libboost_system.dylib $out/lib/libboost_system.dylib $out/lib/libboost_thread.dylib
-    ''
-    + ''
-      # Fix up /usr/bin/env shebangs relied on by the build
-      patchShebangs --build tests/ doc/manual/
-    '';
+  preConfigure = ''
+    # Fix up /usr/bin/env shebangs relied on by the build
+    patchShebangs --build tests/ doc/manual/
+  '';
 
   mesonBuildType = "debugoptimized";
 
@@ -454,14 +434,6 @@ stdenv.mkDerivation (finalAttrs: {
       mkdir -p $out/nix-support
       echo "file binary-dist $out/bin/nix" >> $out/nix-support/hydra-build-products
     ''
-    + lib.optionalString stdenv.isDarwin ''
-      for lib in liblixutil.dylib liblixexpr.dylib; do
-        install_name_tool \
-          -change "${lib.getLib boost}/lib/libboost_context.dylib" \
-          "$out/lib/libboost_context.dylib" \
-          "$out/lib/$lib"
-      done
-    ''
     + lib.optionalString internalApiDocs ''
       mkdir -p $out/nix-support
       echo "doc internal-api-docs $out/share/doc/nix/internal-api/html" >> "$out/nix-support/hydra-build-products"