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.
Fix crash during stepping on ppc32.
* ppc-linux-tdep.c (powerpc_linux_in_dynsym_resolve_code): Test NULL
SYM.
gdb/testsuite/
Fix crash during stepping on ppc32.
* gdb.base/step-symless.c: New file.
* gdb.base/step-symless.exp: New file.