(Oh, I am well aware that this is often not correctly set, but then again,
 why the heck would someone wants to parse the SDP origin in real life?)

              * Use filename sanitization at the lower level

- Some cleanup

Finally rid of the strcasestr warning

There is something seriously messed up in these files though
(like the declaration in xtag.h do not match the definition in xtag.c!)

(which includes config.h which defines the platform feature macros)
Also remember stdio, string and stdlib are included implicitly