proc: Add missing includes into proc_parse.h

Since proc_parse.h declares functions which have
list_head as arguments, it should include list.h
and basic types.

Otherwise if included into the files without list support
the compilation might fail as
 |
 | In file included from cr-check.c:5:
 | ./include/proc_parse.h:83: error: expected declaration specifiers or ‘...’ before ‘bool’

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>