pgsql: If the MSVCRT module is not found in the current binary, proceed

Log Message:
-----------
If the MSVCRT module is not found in the current binary, proceed to update
system and local environments anyway, instead of aborting. (This will
happen in a MSVC build with no or very few external libraries linked in)

Modified Files:
--------------
pgsql/src/port:
win32env.c (r1.3 -> r1.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/port/win32env.c?r1=1.3&r2=1.4)