Install libmcrypt dependency

Author: derickr

.github/workflows/build.yml

@@ -41,6 +41,7 @@ jobs:
                       version: ${{matrix.php}}
                       arch: ${{matrix.arch}}
                       ts: ${{matrix.ts}}
+                      deps: "libmcrypt"
                 - name: Enable Developer Command Prompt
                   uses: ilammy/msvc-dev-cmd@v1
                   with: