Two modifications: 1. The addition of 2013 to the copyright year range for every file; 2. The use of a single year range, instead of potentially multiple year ranges, as approved by the FSF.
* buildsym.c (buildsym_init): Reset using_directives to NULL. testsuite/ * gdb.cp/using-crash.exp: New file. * gdb.cp/using-crash.cc: New file.