REORG: include: move fd.h to haproxy/fd{,-t}.h

REORG: include: move fd.h to haproxy/fd{,-t}.h

A few includes were missing in each file. A definition of
struct polled_mask was moved to fd-t.h. The MAX_POLLERS macro was
moved to defaults.h

Stdio used to be silently inherited from whatever path but it's needed
for list_pollers() which takes a FILE* and which can thus not be
forward-declared.