Split director_exception testcase into two so that testing throw(),
with no arguments, that is nothrows, can be tested separately to throw()
taking arguments. [The throw keyword needs to be removed for C++
compilation in C++11 and later when it was deprecated.]
PHP5's C extension API has changed substantially so you need to use
-php7 to specify you want PHP7 compatible wrappers.
Fixes https://github.com/swig/swig/issues/571