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.
* configure.ac: Removed trailing spaces after backslash.
* gdb.modula2: New directory.
* gdb.modula2/Makefile.in: New file.
* gdb.modula2/unbounded-array.exp: New file.
* gdb.modula2/unbounded1.c: New file.