[1924] Fix makefile

The .cc file must be in _SOURCES, not in nodist_SOURCES. This one is not
generated.

src/lib/cc/Makefile.am

@@ -24,8 +24,9 @@ lib_LTLIBRARIES = libb10-cc.la
 libb10_cc_la_SOURCES = data.cc data.h session.cc session.h
 libb10_cc_la_SOURCES += logger.cc logger.h
 nodist_libb10_cc_la_SOURCES = cc_messages.cc cc_messages.h
+libb10_cc_la_SOURCES += proto_defs.cc
+nodist_libb10_cc_la_SOURCES += proto_defs.h
 libb10_cc_la_LIBADD = $(top_builddir)/src/lib/log/libb10-log.la
-nodist_libb10_cc_la_SOURCES += proto_defs.cc proto_defs.h
 
 CLEANFILES = *.gcno *.gcda session_config.h cc_messages.cc cc_messages.h