Look for the "/threads", "/libs:dll", and "/dbglibs" flags and convert
them to the proper RuntimeLibrary attribute value in the IDE. This is
a 3-to-1 flag mapping and such needs special handling in the parser.
Separation by ',' only works in VS 2008 and below and does not work in
the PlayStation3 VS plugin. Separation by ';' works in VS 10 and all
prior versions.