win32: improved support for c:path path names

Microsoft Windows permits path names of the form 'c:path', without a
path separator after the colon.  The system records a current directory
for each drive and the path is interpreted relative to that.

Since Windows API calls understand 'c:path' path names many commands
in busybox-w32 already work with them.  This commit adds the following:

- The 'cd' shell built-in interprets 'c:path' path names correctly.
  Previously it treated them as relative to the shell's concept of
  the current working directory, not the current directory of the
  specified drive.

- The 'pwd' shell built-in takes the '-a' option to list the current
  directory for all drives.

- 'c:path' path names are subject to tab-completion.

Paths of the form 'c:path' don't work for mapped network drives or
paths that have been associated with a drive using SUBST.

See GitHub issue #147.

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