These tests actually check that no file with a name containing a NUL is
created by the GD image output functions.  This is superfluous, since
it is sufficient to check that the function failed, and that an
appropriate warning has been raised.

We also add missing nullbyte injection tests.

We need to add the curl-specific flags, but we also need to preserve
the general flags, to keep around important stuff like -m32.

This function has been deprecated, with the recommendation that
the count should be explicitly tracked in the aggregate context,
if it is needed.

Unfortunate that = {} is a GNU extension.