Remove STLPort from C++ packaging workflow. (#407)

Author: jonsimantov

.github/workflows/cpp-packaging.yml

@@ -194,7 +194,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        stl: ["c++", "gnustl", "stlport"]
+        stl: ["c++", "gnustl"]
     steps:
       - name: fetch SDK
         uses: actions/[email protected]