Patches to enable MSVC compilation

[Michael Goffioul]

Hi,

Here are 3 patches that re-enable compilation of octave with MSVC.
I splitted the whole stuff in 3 parts to allow separate handling:
- msvc_config.diff: changes in the configure script to take into account
  that *-*-msdosmsvc is not a valid build target anymore with libtool, plus
  some Makefile changes
- msvc_compile.diff: code changes that should be safe to apply and
  should not change the existing logic
- msvc_template_bug.diff: changes needed to work around an MSVC
  template handling bug (seems to be linked to functions as template
  parameter, while the function signature uses inner types)

Michael.

msvc_config.diff
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msvc_compile.diff
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msvc_template_bug.diff
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