[Nut-upsdev] patch for m4/nut_check_libnetsnmp.m4

[Arjen de Korte]

Citeren Tim Rice <tim op multitalents.net>:

> It looks like the change to m4/nut_check_libnetsnmp.m4 in r1968 broke
> the test on at least Solaris 10. Here is one possible fix.

Thanks for the report. AC_CHECK_HEADER is probably easier to use here  
(and AC_TRY_CPP is obsolete, so we really shouldn't use that).

Best regards, Arjen
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