Merge branch 'tb/apply-with-crlf'

"git apply" that is used as a better "patch -p1" failed to apply a
taken from a file with CRLF line endings to a file with CRLF line
endings.  The root cause was because it misused convert_to_git()
that tried to do "safe-crlf" processing by looking at the index
entry at the same path, which is a nonsense---in that mode, "apply"
is not working on the data in (or derived from) the index at all.
This has been fixed.

* tb/apply-with-crlf:
  apply: file commited with CRLF should roundtrip diff and apply
  convert: add SAFE_CRLF_KEEP_CRLF

convert.h

@@ -12,7 +12,8 @@ enum safe_crlf {
 	SAFE_CRLF_FALSE = 0,
 	SAFE_CRLF_FAIL = 1,
 	SAFE_CRLF_WARN = 2,
-	SAFE_CRLF_RENORMALIZE = 3
+	SAFE_CRLF_RENORMALIZE = 3,
+	SAFE_CRLF_KEEP_CRLF = 4
 };
 
 extern enum safe_crlf safe_crlf;