Add port name defaults to the config file instead of hard-coding.

This adds 'default_parallel' and 'default_serial' keywords to the
grammar, which take quoted string arguments.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@214 81a1dc3b-b13d-400b-aceb-764788c761c2

config.c

@@ -30,6 +30,9 @@
 #include "config.h"
 #include "config_gram.h"
 
+char default_parallel[PATH_MAX];
+char default_serial[PATH_MAX];
+
 char string_buf[MAX_STR_CONST];
 char *string_buf_ptr;