patch: fix eolmode=auto with new files
If target file does not exist or has no eol, current code was normalizing eols
to LF. Preserve patch file eols instead.
adding .hgignore
adding a
% invalid eol
applying eol.diff
abort: Unsupported line endings type: LFCR
% force LF
applying eol.diff
'a\nyyyy\ncc\n\nd\ne'
% force CRLF
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
applying eol.diff
'a\r\nyyyy\r\ncc\r\n\r\nd\r\ne'
% auto EOL on LF file
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
applying eol.diff
'a\nyyyy\ncc\n\nd\ne'
% auto EOL on CRLF file
applying eol.diff
'a\r\nyyyy\r\ncc\r\n\r\nd\r\ne'
% auto EOL on new file or source without any EOL
applying noeol.diff
'noeol\r\nnoeol\n'
'neweol\nneweol\r\n'
adding b
% binary patch with --eol
applying bin.diff
'a\x00\nc'