fix a preprocessor for .S

* tell a right line number in error message
      if a #line directive is wrong

    * don't print an error message if we preprocess a .S file
      and #line directive is wrong. This is the case of
      the
        # 4026 bytes
      comment in *.S file.

    * preprocess_skip: skip a line with
	    if (parse_flags & PARSE_FLAG_ASM_COMMENTS)
       		p = parse_line_comment(p);
      if line starts with # and a preprocessor command not found.

      A test program:
      #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
	# This repeats until either a device doesn't exist, or until
      #endif

    * remove a second definition of the TOK_FLAG_* and PARSE_FLAG_*
      from the tccpp.c

libtcc.c

@@ -1177,13 +1177,13 @@ ST_FUNC int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
 
 #ifdef CONFIG_TCC_ASM
     if (!strcmp(ext, "S")) {
-        /* preprocessed assembler */
+        /* non preprocessed assembler */
         ret = tcc_assemble(s1, 1);
         goto the_end;
     }
 
     if (!strcmp(ext, "s")) {
-        /* non preprocessed assembler */
+        /* preprocessed assembler */
         ret = tcc_assemble(s1, 0);
         goto the_end;
     }