[Buildbot] #2958: Add "platform" to renderables in MsBuild4

[Buildbot trac]

#2958: Add "platform" to renderables in MsBuild4
------------------------+-----------------------
Reporter:  cscott       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  minor        |  Milestone:  undecided
 Version:  0.8.9        |   Keywords:  msbuild
------------------------+-----------------------
 I have run into a few situations where it is useful to be able to
 Interpolate the platform argument of MsBuild4. On my own system, I enabled
 this by adding {{{renderables = ['platform']}}} to steps/vstudio.py line
 392 (right under the vcenv_bat declaration)

--
Ticket URL: <http://trac.buildbot.net/ticket/2958>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation