Cannot parse multi-line character literal

[kamphaus]

When trying to parse a character literal that's part of an array initialization on multiple lines, the parsing fails and outputs a warning.

E.g. :

typedef unsigned char pcre_uchar;
#define CHAR_NBSP                   ((unsigned char)'\xa0')

static const pcre_uchar TEST[] =  {
  'x', (pcre_uchar) CHAR_NBSP, '\n', '\0' };

gives the warning:
// Warning (CharacterLiteral): /home/ck/go/src/github.com/elliotchance/c2go/tests/cast2.c:20 : could not read exact character literal: cannot parse character literal: illegal character 'a' at index 0 from atic const pcre_uchar TEST[] = {