vimPlugins.blink-cmp: use sharedLibrary extension (#373302)

pkgs/applications/editors/vim/plugins/non-generated/blink-cmp/default.nix

@@ -16,7 +16,6 @@ let
     tag = "v${version}";
     hash = "sha256-MfHI4efAdaoCU8si6YFdznZmSTprthDq3YKuF91z7ss=";
   };
-  libExt = if stdenv.hostPlatform.isDarwin then "dylib" else "so";
   blink-fuzzy-lib = rustPlatform.buildRustPackage {
     inherit version src;
     pname = "blink-fuzzy-lib";
@@ -35,10 +34,14 @@ in
 vimUtils.buildVimPlugin {
   pname = "blink.cmp";
   inherit version src;
-  preInstall = ''
-    mkdir -p target/release
-    ln -s ${blink-fuzzy-lib}/lib/libblink_cmp_fuzzy.${libExt} target/release/libblink_cmp_fuzzy.${libExt}
-  '';
+  preInstall =
+    let
+      ext = stdenv.hostPlatform.extensions.sharedLibrary;
+    in
+    ''
+      mkdir -p target/release
+      ln -s ${blink-fuzzy-lib}/lib/libblink_cmp_fuzzy${ext} target/release/libblink_cmp_fuzzy${ext}
+    '';
 
   patches = [
     (replaceVars ./force-version.patch { inherit (src) tag; })