Don't annoy people building snaps/dists using VC6

More things for the new build system.
Pi3Web and aolserver build untested (no headers and libs for those here)

Refinements for new build system:
- Add major + minor version to .dll and .exe headers during linking
- Handle pecl build dir correctly when pecl is a sibling of php-src
- try and guess w

Refinements for new build system:
- Add major + minor version to .dll and .exe headers during linking
- Handle pecl build dir correctly when pecl is a sibling of php-src
- try and guess where your cygwin utils are installed (if you have them)
so that we can detect bison, flex etc.
- other little refinements

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Add dist target to makefile that will generate the file layout for
a win32 binary distro under build_dir/_dist_.
This isn't finalized yet, and you need Edin's distro template.