Changed to use VS80COMNTOOLS to determine Visual Studio path - this avoids conficts with other Visual C++ versions, but in the long run, we really should look to the registry for this.

[SVN r25334]

tools/build

@@ -1 +1 @@
-Subproject commit b18b2c6e0fd5f7c9e40a83b01b53e6fc5dc9336f
+Subproject commit e706a77bdb8f787533ea47b2ac60295d09df520b