The Python.h header must be included first to appease the preprocessor.

Additionally, it includes <stdio.h>, <string.h>, <errno.h>, <limits.h>,

<assert.h> and <stdlib.h>, so we don't have to.
Also:


Mark Python code as ssize_t clean

  We don't use any # format variants, but it's best to define this for any future usage.


Remove unused struct members from Python loader


Simplify gplugin_python3_filename_to_module

  I believe the call to g_utf8_strrchr was in error, as the second argument is

  length in bytes, but g_utf8_strlen returns length in characters, which is

  shorter. In any case, it accepts -1 anyway, so there's no need to count the

  length.

Compile and ninja test