tests: apply binary mode to output in seq.py

I noticed this when playing with running tests using WSL, and iterating over the
output yielded '0\r', '1\r',...  Most of the other *.py tools do this, and `seq`
on MSYS lacks '\r' in the output, so this is more consistent.

tests/seq.py

@@ -8,8 +8,17 b''
 #   seq START STEP STOP   [START, STOP] stepping by STEP
 
 from __future__ import absolute_import, print_function
+import os
 import sys
 
+try:
+    import msvcrt
+    msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
+    msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
+    msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
+except ImportError:
+    pass
+
 if sys.version_info[0] >= 3:
     xrange = range