SI-9472 make Git use LF line endings on Windows

this is mostly intended for .scala files, since because """ preserves
line endings, so we get different results if source files have CRLF.
this was making a few tests fail on Windows (because they used """ to
enclose expected output)

Author: SethTisue

.gitattributes

@@ -2,20 +2,24 @@
 # this must be first so later entries will override it
 * text=auto
 
+# check out text files with lf, not crlf, on Windows.  (especially
+# important for Scala source files, since """ preserves line endings)
+text eol=lf
+
 # These files are text and should be normalized (convert crlf => lf)
-*.c       text
-*.check   text
-*.css     text
-*.flags   text
-*.html    text
-*.java    text
-*.js      text
-*.policy  text
-*.sbt     text
-*.scala   text
-*.sh      text
-*.txt     text
-*.xml     text
+*.c       eol=lf
+*.check   eol=lf
+*.css     eol=lf
+*.flags   eol=lf
+*.html    eol=lf
+*.java    eol=lf
+*.js      eol=lf
+*.policy  eol=lf
+*.sbt     eol=lf
+*.scala   eol=lf
+*.sh      eol=lf
+*.txt     eol=lf
+*.xml     eol=lf
 
 # Windows-specific files get windows endings
 *.bat     eol=crlf