Remove irrelevant build job

Author: cmb69

.appveyor.yml

@@ -35,9 +35,6 @@ environment:
         #PDO_PGSQL_TEST_DSN: "pgsql:host=127.0.0.1 port=5432 dbname=test user=postgres password=Password12!"
         #build permutations
         matrix:
-                - THREAD_SAFE: 0
-                  OPCACHE: 0
-                  PARALLEL: -j2
                 - THREAD_SAFE: 1
                   OPCACHE: 1
                   PARALLEL: -j2