We no longer need mongo_vstudio.cpp and it is removed from the Git
repository with this commit. Visual Studio 2010 will now generate its
own copies of shell/mongo.cpp and shell/mongo-server.cpp. The code
that creates these files closely mimics the jsToH function in SConstruct
such that the resulting files are identical (quirks and all).
SConstruct no longer creates shell/mongo_vstudio.cpp and Visual Studio
creates and uses the same filename as SCons (shell/mongo.cpp). All
projects that were using mongo_vstudio.cpp will now instead generate
shell/mongo.cpp as a "Pre-Build" step.
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