Updated SQL Server extensions to fix build failures on PHP 7.4

.travis.yml

@@ -37,9 +37,6 @@ after_script:
     fi
 
 jobs:
-  allow_failures:
-    - php: 7.4snapshot
-
   include:
 
     - stage: Smoke Testing

lib/Doctrine/DBAL/Schema/SQLServerSchemaManager.php

@@ -340,7 +340,9 @@ class SQLServerSchemaManager extends AbstractSchemaManager
 
         $tableOptions = $this->_conn->fetchAssoc($sql);
 
+        if ($tableOptions !== false) {
             $table->addOption('comment', $tableOptions['table_comment']);
+        }
 
         return $table;
     }

tests/travis/install-mssql-pdo_sqlsrv.sh

@@ -4,4 +4,4 @@ set -ex
 
 echo "Installing extension"
 
-pecl install pdo_sqlsrv
+pecl install pdo_sqlsrv-5.7.0preview

tests/travis/install-mssql-sqlsrv.sh

@@ -4,4 +4,4 @@ set -ex
 
 echo "Installing extension"
 
-pecl install sqlsrv
+pecl install sqlsrv-5.7.0preview