[M68k] Fix extract-section.py under Python 3

[ricky26]

Summary

read_raw_stdin() was opening a file in binary mode, but Popen
was being told to use text mode (universal_newlines). This is
benign on Python 2 but an error on Python 3.

[myhsu]

yes you're right about this, thanks :-)
LGTM

[myhsu]

If you don't have commit access I can commit on your behave

[ricky26]

I do not, please commit this @myhsu! :)

llvm/utils/extract-section.py

else:
             msvcrt.setformat(sys.stdin.fileno(), os.O_BINARY)
         reading_source = sys.stdin
     return reading_source.read()
 
 def get_raw_section_dump(readobj_path, section_name, input_file):
     import subprocess
     cmd = [readobj_path, '-elf-output-style=GNU', '--hex-dump={}'.format(section_name),
             input_file]
-    proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
-            universal_newlines=True)
+    proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
 
     if input_file == '-':
         # From stdin
         out,_ = proc.communicate(input=read_raw_stdin())
     else:
         out,_ = proc.communicate()
 
     return out.decode('utf-8') if type(out) is not str else out