Update copyright notes to match recent gnulib-related changes.
* notes/copyright: Add aclocal.m4, m4/*.m4, lib/Makefile.in, arg-nonnull.h, c++defs.h, compile, depcomp, missing, warn-on-use.h, lib/*.[ch], lib/gnulib.mk. Remove src/mktime.c, lib-src/getopt1.c, lib-src/getopt_int.h (files are now in lib and are subsumed by the lib/*.[ch] rule). Remove m4/getopt.m4 (now subsumed by m4/*.m4 rule). config.guess, config.sub, and doc/man/texinfo.tex are now copied in from gnulib.
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