pgsql: Continue running contrib regression tests if one fails, and exit

Log Message:
-----------
Continue running contrib regression tests if one fails, and exit
with errorlevel 1 is >= 1 checks failed.

Modified Files:
--------------
pgsql/src/tools/msvc:
vcregress.bat (r1.8 -> r1.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/vcregress.bat.diff?r1=1.8&r2=1.9)