Bugfix: Use EXTRA_*_DEPENDENCIES for Cygwin workaround, to fix program make dependencies

Makefile.am

@@ -29,7 +29,7 @@ bfgminer_SOURCES := miner.c
 bfgminer_SOURCES	+= elist.h miner.h compat.h bench_block.h	\
 		   util.c util.h uthash.h logging.h		\
 		   sha2.c sha2.h api.c
-bfgminer_DEPENDENCIES =
+EXTRA_bfgminer_DEPENDENCIES =
 
 if NEED_LIBBLKMAKER
 SUBDIRS           += libblkmaker
@@ -38,7 +38,7 @@ bfgminer_LDFLAGS  += -Llibblkmaker/.libs -Wl,-rpath,libblkmaker/.libs
 bfgminer_LDADD    += -lblkmaker-0.1 -lblkmaker_jansson-0.1
 
 if HAVE_CYGWIN
-bfgminer_DEPENDENCIES += cygblkmaker-0.1-0.dll cygblkmaker_jansson-0.1-0.dll
+EXTRA_bfgminer_DEPENDENCIES += cygblkmaker-0.1-0.dll cygblkmaker_jansson-0.1-0.dll
 
 cyg%.dll: libblkmaker/.libs/cyg%.dll
 	cp -p $< $@