tests: use hghave eol-in-paths to test for support for ':' in filenames and " "
It is an approximation but seems to work ok ... and testing that 'foo:bar'
creates a real file and not just a resource fork is not completely trivial.
tests: use a different evil name in test-hgweb-raw.t
The test used a filename with ':' which prevented the test from running on
Windows and FAT.
It now uses a filename with space and '%' and will thus still exercise proper
url escaping.