Rejig VS projects to avoid compiling files twice.

We now have a libmupdf that has all the usual files in, plus a
libmupdf-v8 and a libmupdf-nov8 with/without javascript
respectively. libmupdf-v8 and libmupdf-nov8 both depend on libmupdf,
and the apps depend on libmupdf-{no,}v8 as appropriate.

This means every file is listed (and compiled) strictly once, and
better matches the style of the unix builds. It also prevents VS
getting confused and listing files twice in search results.

Also, we strip out the unnecessary repeated calls to generate.bat,
which result in occasional spurious build failures.

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