Merge pull request #17618 from protocolbuffers/cp-utf8-ascii-28.x

Remove `/utf-8` flag added in #14197

Author: zhangskz

build_defs/cpp_opts.bzl

@@ -15,7 +15,6 @@ COPTS = select({
         "/wd4506",  # no definition for inline function 'function'
         "/wd4800",  # 'type' : forcing value to bool 'true' or 'false' (performance warning)
         "/wd4996",  # The compiler encountered a deprecated declaration.
-        "/utf-8",  # Set source and execution character sets to UTF-8
     ],
     "//conditions:default": [
         "-DHAVE_ZLIB",