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_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/0f90fb90c337afd2cb9a41af51660367a1e85743

Modified Files
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doc/src/sgml/runtime.sgml |   62 ++++++++++++++++++++++++++++++++-------------
1 files changed, 44 insertions(+), 18 deletions(-)

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