BaseTools:Coding problems caused by special characters

BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1670

During BaseTools compiling under Chinese or Japanese
language Windows, python exception occurring.
UnicodeDecodeError: 'ascii' codec can't decode byte 0xbd
in position 3528: ordinal not in range(128)

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/C/Makefiles/NmakeSubdirs.py

@@ -44,7 +44,7 @@ def RunCommand(WorkDir=None, *Args, **kwargs):
     stdout, stderr = p.communicate()
     message = ""
     if stdout is not None:
-        message = stdout.decode() #for compatibility in python 2 and 3
+        message = stdout.decode(encoding='utf-8', errors='ignore') #for compatibility in python 2 and 3
 
     if p.returncode != 0:
         raise RuntimeError("Error while execute command \'{0}\' in direcotry {1}\n{2}".format(" ".join(Args), WorkDir, message))