Ignore CR (\r) when reading .jvmopts, for Windows

[dwijnand]

A .jvmopts file checked out on Windows could have \r\n line endings, which are then misread by the line-by-line reading of .jvmopts. You can avoid that happening with a setting in .gitattributes, but it would be even better to handle it nicely out of the box.

Here are some nice notes: scala/scala#9496 (comment)