pkgsStatic.fmt: don't build shared libs

The change in `static.nix` was added in
#76875 but apparently
`enabledShared` got removed in the master/staging-next merge.

(cherry picked from commit 759a281)

pkgs/development/libraries/fmt/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, fetchpatch, cmake }:
+{ stdenv, fetchFromGitHub, fetchpatch, cmake, enableShared ? true }:
 
 stdenv.mkDerivation rec {
   pname = "fmt";
@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = [
-    "-DBUILD_SHARED_LIBS=ON"
+    "-DBUILD_SHARED_LIBS=${if enableShared then "ON" else "OFF"}"
     "-DCMAKE_SKIP_BUILD_RPATH=OFF" # for tests
   ];