Fix chromaprint dependencies

contrib/src/chromaprint/rules.mak

@@ -3,7 +3,7 @@
 CHROMAPRINT_VERSION := 0.7
 CHROMAPRINT_URL := https://bitbucket.org/acoustid/chromaprint/downloads/chromaprint-$(CHROMAPRINT_VERSION).tar.gz
 
-#PKGS += chromaprint
+PKGS += chromaprint
 ifeq ($(call need_pkg,"libchromaprint"),)
 PKGS_FOUND += chromaprint
 endif
@@ -18,7 +18,9 @@ chromaprint: chromaprint-$(CHROMAPRINT_VERSION).tar.gz .sum-chromaprint
 	$(APPLY) $(SRC)/chromaprint/avutil.patch
 	$(MOVE)
 
-.chromaprint: chromaprint toolchain.cmake
+DEPS_chromaprint = ffmpeg $(DEPS_ffmpeg)
+
+.chromaprint: chromaprint .ffmpeg toolchain.cmake
 	cd $< && $(HOSTVARS_PIC) $(CMAKE) -DBUILD_SHARED_LIBS:BOOL=OFF
 	cd $< && $(MAKE) install
 	touch $@