Update information about configuring SysV IPC parameters on NetBSD.

Per Emmanuel Kasper, sysctl works fine as of NetBSD 5.0.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/83c461e8fa158130f885dc4570217f49cfd61f55

Modified Files
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doc/src/sgml/runtime.sgml |   64 +++++++++++++++++++++++++++++++-------------
1 files changed, 45 insertions(+), 19 deletions(-)

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