call getKnownJavacLints error when locale language is chinese

[ningpengtao-coder]

reason:
When compiling graalvmjdk, mx calls getKnownJavacLints if the local language is Chinese, it will cause UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbf in position 19: invalid start byte, and there is no problem if the local language is English
resolution:
Add errors="ignore" named parameter to ignore errors when decoding strings

[Terrency]

workaround instructions for some mx beginner from developer:
change mx\src\mx\_impl\support\processes.py
line 59
return subprocess.check_output(*args, **kwargs).decode(errors="ignore")