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.
... following the file renaming in the previous commit.
gdb/ChangeLog:
* sparc-ravenscar-thread.h: SPARC_RAVENSCAR_THREAD_H renames
RAVENSCAR_SPARC_THREAD_H.
* sparc-ravenscar-thread.c: Rename all global entities
whose name is uses "ravenscar_sparc" as the prefix to use
"sparc_ravenscar" instead.
