[PATCH] acinclude.m4 fixes for wx 2.6, wx-nondebug, postgres-ssl and others

Hi

This patch
.) Doesn't actually switch pgadmin3 over to using wx2.6 aka CVS HEAD ;-)
.) It just e.g. adds a 2.6-case to checks where there is a 2.4 and a 2.5 case
.) It works around the postgres-ssl problem on osx, by checking
wether libpq links libssl directly (otool -L ;-) ).
.) Fixes statically linking against libpq (There is no libcrypt on osx)
.) Fixes linking against a non-debug wxMac. Non-debug versions are
named macu_*, but relevant part of acinclude.m4 only checked for mac, mac_d & macud.
Added macu

Statically linking pgadmin3 against libpq and wx now works for me out-of-the-box
This should fix both the problems OpenMacNew was having, and the "I have to fiddle
with LIBS" problems

Everybody with a Mac - please test, if you have the time ;-))))

greetings, Florian Pflug