KWSys: Fix SharedForward on Cygwin without -mwin32
When building on Cygwin without -mwin32, the _WIN32 macro may not be defined. SharedForward must still set the PATH environment variable to ensure runtime dependencies are found. The 'ldd' wrapping feature uses 'cygcheck' for now since a real ldd tool is not available in Cygwin 1.5. We can change to use the real ldd when we choose to stop supporting legacy Cygwin and require 1.7.
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