core: sys/types is already included in collectd.h

[rubenk]

No description provided.

[pyr]

@rubenk is this fixing any error on some system ? <sys/types.h> is usually protected against multiple includes.

[rubenk]

@pyr, no just good practice. We check for <sys/types.h> with ./configure but don't wrap it in HAVE_SYS_TYPES_H everywhere. If we only include it from collectd.h there's less change for plugin authors to do it wrong.

[pyr]

@rubenk I think the check for sys/types.h can be killed, we're not going to be in luck on a system where that doesn't exist :-) If you really want to work on a PR in that space, you can kill the sys/types.h check and remove the #ifdefs.

[rubenk]

Ok, I'll do that in a separate PR, thanks.