Add missing libblst to GHC options of wrapped-cabal in static mode. (#125)

* Add missing libblst to GHC options of wrapped-cabal in static mode.

* comment out post-fixup

* Overwrite buildPhase for libblst static

  The current buildPhase in NixOS/nixpkgs does something like this:

  ```
  ./build.sh ${lib.optionalString stdenv.hostPlatform.isWindows "flavour=mingw64"}
  ./build.sh -shared ${lib.optionalString stdenv.hostPlatform.isWindows "flavour=mingw64"}
  ```

  So we do build both a dynamic and static version, for convenience,
  which is then correctly visible in the nix store (both `.a` and
  `.dylib` are present).

  BUT, it seems that because of the presence of the dynamic lib, cabal
  or GHC (?) still chose to bundle the library dynamically despite the
  static flags. Removing the `.dylib` from the nix store recover the
  expected behavior (libblst being statically linked).

  This is odd, but the current fix is to not build the `-shared` version
  of the library at all when in the static shell.

  Co-authored-by: yvan-sraka <yvan@sraka.xyz>

* Enforce the use of static libraries in `-static` devshell

---------

Co-authored-by: Yvan Sraka <yvan@sraka.xyz>

Author: KtorZ

flake.nix

@@ -23,6 +23,15 @@
           static-openssl = (final.openssl.override { static = true; });
           static-zlib = final.zlib.override { shared = false; };
           static-pcre = final.pcre.override { shared = false; };
+          static-libblst = final.libblst.overrideDerivation (old: {
+            configureFlags = old.configureFlags ++ [ "--enable-static" "--disable-shared" ];
+            buildPhase = ''
+              runHook preBuild
+              ./build.sh
+              runHook postBuild
+            '';
+            postFixup = "";
+          });
         });
          # the haskell inline-r package depends on internals of the R
          # project that have been hidden in R 4.2+. See

static.nix

@@ -39,6 +39,7 @@ let tool-version-map = import ./tool-map.nix;
                 --ghc-option=-L${lib.getLib static-gmp}/lib \
                 --ghc-option=-L${lib.getLib static-libsodium-vrf}/lib \
                 --ghc-option=-L${lib.getLib static-secp256k1}/lib \
+                --ghc-option=-L${lib.getLib static-libblst}/lib \
                 --ghc-option=-L${lib.getLib static-openssl}/lib
             ;;
             clean|unpack)
@@ -105,15 +106,14 @@ pkgs.mkShell (rec {
         # it _should_ probably call out to a g++ or clang++ but doesn't.
         stdenv.cc.cc.lib
     ]) ++ map lib.getDev ([
-        static-gmp
-
-        zlib
         pcre
-        openssl
+        static-gmp
+        static-openssl
+        static-zlib
     ] ++ lib.optionals withIOG [
-        libblst
-        libsodium-vrf
-        secp256k1
+        static-libblst
+        static-libsodium-vrf
+        static-secp256k1
         #R_4_1_3      # for plutus
         postgresql    # for db-sync
         icu           # for cardano-cli