[Pidgin] #2608: Including sys/sysctl.h requires sys/param.h on NetBSD.

[Pidgin]

#2608: Including sys/sysctl.h requires sys/param.h on NetBSD.
--------------------------+-------------------------------------------------
 Reporter:  gdt           |       Type:  defect
   Status:  new           |   Priority:  minor 
Component:  pidgin (gtk)  |    Version:  2.1.0 
 Keywords:                |    Pending:  0     
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 On NetBSD, including sys/sysctl.h is documented to require sys/param.h.
 On FreeBSD, it is documented to require sys/types.h.  libpurple/nat-pmp.c
 does not include either.

 Fix: in configure.ac, check for sys/param.h, and if found include it
 before sys/sysctl.h.
 Also, include sys/types.h before sys/sysctl.h for FreeBSD (untested).

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Ticket URL: <http://developer.pidgin.im/ticket/2608>
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