PHP, meet MySQL

All pdo_mysql tests are skipped on AppVeyor because "No such host is
known".  We change the DSN to use semicolons instead of spaces to fix
that.

Author: cmb69

appveyor/test_task.bat

@@ -27,7 +27,7 @@ set PDO_MYSQL_TEST_USER=%MYSQL_TEST_USER%
 set PDO_MYSQL_TEST_PASS=%MYSQL_PWD%
 set PDO_MYSQL_TEST_HOST=%MYSQL_TEST_HOST%
 set PDO_MYSQL_TEST_PORT=%MYSQL_TEST_PORT%
-set PDO_MYSQL_TEST_DSN=mysql:host=%PDO_MYSQL_TEST_HOST% port=%PDO_MYSQL_TEST_PORT% dbname=test user=%PDO_MYSQL_TEST_USER% password=%MYSQL_PW%
+set PDO_MYSQL_TEST_DSN=mysql:host=%PDO_MYSQL_TEST_HOST%;port=%PDO_MYSQL_TEST_PORT%;dbname=test;user=%PDO_MYSQL_TEST_USER%;password=%MYSQL_PW%
 "C:\Program Files\MySql\MySQL Server 5.7\bin\mysql.exe" --user=%MYSQL_TEST_USER% -e "CREATE DATABASE IF NOT EXISTS test"
 if %errorlevel% neq 0 exit /b 3