update copyright notices in various GDB files.

update copyright notices in various GDB files.

Update some files in GDB that were accidently left with a GPL v2
copyright header.

Update some files where the copyright notice still provides the
old contact info, using the approach for providing the FSF's contact
info.

gdb/ChangeLog:

        * acinclude.m4: Update contact info in copyright notice.

gdb/doc/ChangeLog:

        * refcard.tex: Update copyright notice to GPL v3 or later.
        Update contact info.

gdb/testsuite/ChangeLog:

        * dg-extract-results.sh: Update contact info in copyright notice.
        * gdb.arch/mips-octeon-bbit.exp: Update copyright notice to
        GPL v3 or later.  Update contact info.
        * gdb.fortran/logical.f90, gdb.threads/watchpoint-fork-child.c,
        gdb.threads/watchpoint-fork-mt.c,
        gdb.threads/watchpoint-fork-parent.c,
        gdb.threads/watchpoint-fork-st.c,
        gdb.threads/watchpoint-fork.h: Likewise.