rebuild Makefile.in to include COPYING

Makefile.in

@@ -37,8 +37,8 @@ build_triplet = @build@
 host_triplet = @host@
 DIST_COMMON = README $(am__configure_deps) $(srcdir)/Makefile.am \
 	$(srcdir)/Makefile.in $(srcdir)/config.h.in \
-	$(top_srcdir)/configure AUTHORS ChangeLog INSTALL config.guess \
-	config.sub depcomp install-sh missing
+	$(top_srcdir)/configure AUTHORS COPYING ChangeLog INSTALL \
+	config.guess config.sub depcomp install-sh missing
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \