Remove dependency to CPP: support for #include directive

The parser is prepared to handle '#' directives, starting with file
inclusion. The search path for the file are taken from what was
actually given to CPP. There is an arbitrary limit to the inclusion
nesting, which is actually not a design limitation but a security
to avoid infinite include loops.

src/rootmenu.c

@@ -969,7 +969,7 @@ static WMenu *readMenuFile(WScreen * scr, char *file_name)
 			return NULL;
 		}
 	}
-	parser = WMenuParserCreate(file_name, file);
+	parser = WMenuParserCreate(file_name, file, DEF_CONFIG_PATHS);
 
 	while (WMenuParserGetLine(parser, &title, &command, &params, &shortcut)) {
 
@@ -1060,7 +1060,7 @@ static WMenu *readMenuPipe(WScreen * scr, char **file_name)
 			return NULL;
 		}
 	}
-	parser = WMenuParserCreate(flat_file, file);
+	parser = WMenuParserCreate(flat_file, file, DEF_CONFIG_PATHS);
 
 	while (WMenuParserGetLine(parser, &title, &command, &params, &shortcut)) {