Eliminate another straight forward TSRMLS_FETCH() in zend_startup_module()

Eliminate another straight forward TSRMLS_FETCH() in zend_startup_module()

# For THTTPD:
# The code that uses a call to this function is for older versions of PHP anyway so its not covered

# For Zend OpCache:
# Added a new define for 5.6 and wrapped the code around that so its still compatible with older version