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.
The testcase is assuming that the parameter being watched isn't being
modified. But the way the test program is written, this is not true
at all. So this changes fixes the code to still reference the variable,
but in a way that does not modify its value.
gdb/testsuite:
* gdb.ada/watch_arg/pck.ads, gdb.ada/watch_arg/pck.adb: New files.
* gdb.ada/watch_arg/watch.adb: Adjust code to avoid modification
of parameter X in procedure Foo.
