Support vertical tabs and treat them as whitespace (#218)

Some preprocessors don't remove the vertical tab from the input
so we should be able to handle them in the lexer.

Author: bschommer

cparser/Lexer.mll

@@ -177,7 +177,7 @@ let identifier_nondigit =
 let identifier = identifier_nondigit (identifier_nondigit|digit)*
 
 (* Whitespaces *)
-let whitespace_char_no_newline = [' ' '\t' '\012' '\r']
+let whitespace_char_no_newline = [' ' '\t'  '\011' '\012' '\r']
 
 (* Integer constants *)
 let nonzero_digit = ['1'-'9']