Add utility functions for determining character length of strings. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: daryl.mcdaniel@intel.com Reviewed-by: erik.c.bjorge@intel.com Reviewed-by: lee.g.rosenbaum@intel.com StdLib/LibC/ Locale/multibyte_Utf8.c Improve comments. Define implementation-specific MBCS utility functions, as declared in <stdlib.h>. Enhance functionality of EncodeUtf8() and improve error handling. Set correct conversion state in wcrtomb(). Bug fixes in wcsrtombs(). Make wctob() properly MBCS compliant. Main/Main.c Remove code obsoleted by new wcsrtombs() implementation. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13785 6f19259b-4bc3-4df7-8a09-765794883524