pgsql: Remove optreset from src/port/ implementations of getopt and get

Remove optreset from src/port/ implementations of getopt and getopt_long.

We don't actually need optreset, because we can easily fix the code to
ensure that it's cleanly restartable after having completed a scan over the
argv array; which is the only case we need to restart in. Getting rid of
it avoids a class of interactions with the system libraries and allows
reversion of my change of yesterday in postmaster.c and postgres.c.

Back-patch to 8.4. Before that the getopt code was a bit different anyway.

Branch
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REL8_4_STABLE

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=0a0eec670dcfc6a7fe9f5717e85b6f651a6754b8

Modified Files
--------------
src/backend/postmaster/postmaster.c | 5 ++---
src/include/getopt_long.h | 1 -
src/port/getopt.c | 20 +++++++++++---------
src/port/getopt_long.c | 20 +++++++++++---------
4 files changed, 24 insertions(+), 22 deletions(-)