[D-runtime] latest druntime fails on Windows

[Walter Bright]

Upgrading to the latest druntime produces, on Windows (things work 
successfully on Linux & OSX):

1. Phobos unittest fails:

unittest
Memory allocation failed
No service for epmap.
Memory allocation failed

--- errorlevel 1

The "no service for epmap." message is expected, the others are not.

2. dmd test suite fails:

..\dmd  -run eh
start
try 1
finally 1
try 1
finally 1
try 2
done
foo
i = 0
catch, i = 0
i = 1
catch, i = 1
i = 2
catch, i = 2
i = 3
catch, i = 3
i = 4
catch, i = 4
i = 5
catch, i = 5
i = 6
catch, i = 6
i = 7
catch, i = 7
i = 8
catch, i = 8
i = 9
catch, i = 9
foo
i = 0
catch, i = 0
i = 1
catch, i = 1
i = 2
catch, i = 2
i = 3
catch, i = 3
i = 4
catch, i = 4
i = 5
catch, i = 5
i = 6
catch, i = 6
i = 7
catch, i = 7
i = 8
catch, i = 8
i = 9
catch, i = 9
iterations 10 totals: 10, 0
a
--
tb
b
Starting test
object.Error: Access Violation
object.Error: Access Violation

--- errorlevel 1