chromaprint: remove dummy.cpp

We provide the proper C++ runtime in our pkg-config files. If it comes from the
system it should either be a dynamic library (likely) or a static library that
should do it as well. Otherwise it's the problem of the system maintainers.

modules/stream_out/Makefile.am

@@ -103,7 +103,7 @@ libstream_out_rtp_plugin_la_LIBADD += $(SRTP_LIBS) $(GCRYPT_LIBS)
 endif
 
 # Chromaprint plugin
-libstream_out_chromaprint_plugin_la_SOURCES = stream_out/chromaprint.c stream_out/chromaprint_data.h dummy.cpp
+libstream_out_chromaprint_plugin_la_SOURCES = stream_out/chromaprint.c stream_out/chromaprint_data.h
 libstream_out_chromaprint_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) $(CHROMAPRINT_CFLAGS)
 libstream_out_chromaprint_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(soutdir)'
 libstream_out_chromaprint_plugin_la_LIBADD = $(CHROMAPRINT_LIBS)