Implement drive-relative paths and per-drive working dir.

* winsup/cygwin/path.cc (normalize_win32_path): When
a drive-relative path is normalized, look up the remembered
working directory of that drive in the environment.
A drive-relative path is, for example, "C:file.txt".
Or just "C:", with no component.  If there is no path
for the drive in the environment, then the root directory
is used, and the "C:" part thus becomes "C:\", causing
the path to refer to "C:\file.txt". Otherwise the path is
inserted, with a backslash, like "C:\users\bob\file.txt".
The Windows convention for storing these per-drive paths
in the environment is to use environment variables based
on drive letters. For instance the path for the C drive is
stored in the environment variable "!C:" (bang, letter, colon).
The path includes the C:\ prefix.
(cwdstuff::override_win32_cwd): Add the behavior of associating
the current working directory with its drive (if it is a
current working directory based on a drive). For instance
if the overriding cwd is "C:\Users", then the "C:\Users"
path is stored into the "!C:" environment variable.

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