Remove UPnP support. fixes #2500

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

src/Makefile.am

@@ -203,7 +203,7 @@ obj/build.h: FORCE
 libbitcoin_util_a-clientversion.$(OBJEXT): obj/build.h
 
 # server: zcashd
-libbitcoin_server_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(MINIUPNPC_CPPFLAGS) $(EVENT_CFLAGS) $(EVENT_PTHREADS_CFLAGS)
+libbitcoin_server_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(EVENT_CFLAGS) $(EVENT_PTHREADS_CFLAGS)
 libbitcoin_server_a_SOURCES = \
   sendalert.cpp \
   addrman.cpp \
@@ -411,7 +411,6 @@ zcashd_LDADD += \
   $(BDB_LIBS) \
   $(SSL_LIBS) \
   $(CRYPTO_LIBS) \
-  $(MINIUPNPC_LIBS) \
   $(EVENT_PTHREADS_LIBS) \
   $(EVENT_LIBS) \
   $(LIBZCASH) \