#786 dos/win32: Print [#] produces \r\r\n line endings if stdout redirected

[dkl]

Example for the DOS rtlib:

'' The DOS rtlib uses fwrite(stdout) to 'print' stuff when stdout
'' is redirected (fb_ConsolePrintBufferEx_STDIO), and the result is
'' a\r\r\n instead of a\r\n, because fwrite() replaces \n by \r\n,
'' because stdout is opened in text mode, not binary.
print !"a\r\n";

'' The same happens with the rtlib's own \r\n (FB_NEWLINE),
'' which it adds behind normal print's.
print "a"

The same happens on Win32 with Open Cons, at least if redirected to a file:

open cons for output as #1
print #1, "foo"
close #1

This is probably caused by Open Cons using fb_DevFileWrite() -> fwrite() on stdout.

Maybe the rtlib should have a flag on its internal file handles that tells the Print code whether to use \n or \r\n.