cmd: /r is equivalent to /c

[Ann and Jason Edmeades]

Concept of patch is fine (and we ought to support it), but I dont think
this would work as coded (if (tolowerW(c)=='c'||'r') will always be true).
  Also, can you add a quick test for it (there's cmd.exe /c tests - just
add a cmd.exe /r echo test worked).

PS You might want to just hold off until the patch I submitted last night
gets committed as well otherwise there will be merge conflicts ("Change
command line parsing away from argv/argc")
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