Fix arc handling of "\n" files on Windows in SVN
Fix arc handling of "\n" files on Windows in SVN

Summary:
On Windows, a diff may have "\n" newlines (from the file itself) but "\r\n" blocks (from svn).

NOTE: indents are funky since I edited this with Notepad++, I'll fix before landing.

Test Plan: Diffed an edit to a "\n" newline file on Windows in SVN.

Reviewers: btrahan, vrana

Reviewed By: vrana

CC: aran

Differential Revision: https://secure.phabricator.com/D2998

uber/arcanist,wikimedia/phabricator-arcanist,wharris/arcanist,PageUpPeopleOrg/arcanist-patches,uber/arcanist,wharris/arcanist,kevinseelbach/arcanist,phacility/arcanist,dguo-coursera/arcanist,memsql/arcanist,aik099/arcanist,codelabs-ch/arcanist,Symplicity/arcanist,haskell-infra/arcanist,jra3/arcanist,coursera/arcanist,r4nt/arcanist,fivestars/arcanist,zhihu/arcanist,calblueprint/arcanist,haskell-infra/arcanist,julkiewicz/arcanist,Khan/arcanist,Symplicity/arcanist,folsom-labs/arcanist,fivestars/arcanist,wikimedia/phabricator-arcanist,KieranHayes/arcanist,eSpark/arcanist,r4nt/arcanist,codelabs-ch/arcanist,aik099/arcanist,sneakpeeq/arcanist,calblueprint/arcanist,wharris/arcanist,KieranHayes/arcanist,wxstars/arcanist,aik099/arcanist,chundongwang/arcanist,Symplicity/arcanist,wharris/arcanist,kevinseelbach/arcanist,sneakpeeq/arcanist,julkiewicz/arcanist,wxstars/arcanist,phacility/arcanist,uber/arcanist,memsql/arcanist,phacility/arcanist,codelabs-ch/arcanist,phacility/arcanist,dguo-coursera/arcanist,alexmv/arcanist,dguo-coursera/arcanist,wikimedia/phabricator-arcanist,uber/arcanist,zhihu/arcanist,jra3/arcanist,r4nt/arcanist,coursera/arcanist,chundongwang/arcanist,wxstars/arcanist,haskell-infra/arcanist,PageUpPeopleOrg/arcanist-patches,haskell-infra/arcanist,fivestars/arcanist,calblueprint/arcanist,alexmv/arcanist,alexmv/arcanist,hach-que/arcanist,kevinseelbach/arcanist,hach-que/arcanist,zhihu/arcanist,PageUpPeopleOrg/arcanist-patches,fivestars/arcanist,memsql/arcanist,eSpark/arcanist,folsom-labs/arcanist,sneakpeeq/arcanist,chundongwang/arcanist,PageUpPeopleOrg/arcanist-patches,Khan/arcanist,wikimedia/phabricator-arcanist,julkiewicz/arcanist,alexmv/arcanist,coursera/arcanist,folsom-labs/arcanist,Symplicity/arcanist,memsql/arcanist,phacility/arcanist,aik099/arcanist,eSpark/arcanist,zhihu/arcanist,sneakpeeq/arcanist,eSpark/arcanist,Khan/arcanist,dguo-coursera/arcanist,hach-que/arcanist,folsom-labs/arcanist,julkiewicz/arcanist,wxstars/arcanist,kevinseelbach/arcanist,KieranHayes/arcanist,jra3/arcanist,r4nt/arcanist,coursera/arcanist,KieranHayes/arcanist,hach-que/arcanist,jra3/arcanist,chundongwang/arcanist,codelabs-ch/arcanist,calblueprint/arcanist,codelabs-ch/arcanist,Khan/arcanist