AIX 4.2.1 regression test

Hi,

AIX 4.2.1 regression tests are ok :-)

int2 .. failed other errmsg (ok)
int4 .. failed other errmsg (ok)
float8 .. failed has correct output / expected is wrong (ok)
geometry .. failed rounding diffs (ok)
abstime .. failed PDT instead of PST in some rows, 1h difference (ok)
tinterval .. failed --"--
horology .. failed --"--
inet .. failed expected/inet.out is incorrect (ok, but please remake)
rules .. failed other sort order in select * from rtest_admin (guess ok)

It would need only the following modifikations to current CVS:

remove file src/makefiles/Makefile.aix4
no harm because it is not used (it does not work 100% because it won't resolve variables
from postgres main executable, therefore the postgres.imp is still needed) .
alternatively I could try to do a new one
modify configure test for cpp stdin
currently does xlc -E and fails to notice, that it does not work
hand made libplpgsql.so
the command was:
ld -H512 -bM:SRE -bI:/usr/postgres/lib/postgres.imp -bexpall -o libplpgsql.so.1.0 \
pl_comp.o pl_exec.o pl_funcs.o pl_handler.o pl_parse.o -lc
the -bexpall makes it easier, but is new since AIX 4.2, so those with 3.2 or 4.1 still
need to do the .exp stuff

cheers :-)
Andreas