depends: add ability to skip building zeromq

depends/Makefile

@@ -7,6 +7,7 @@ SDK_PATH ?= $(BASEDIR)/SDKs
 NO_QT ?=
 RAPIDCHECK ?=
 NO_WALLET ?=
+NO_ZMQ ?=
 NO_UPNP ?=
 FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
 
@@ -93,6 +94,7 @@ $(host_arch)_$(host_os)_id_string+=$(shell $(host_STRIP) --version 2>/dev/null)
 qt_packages_$(NO_QT) = $(qt_packages) $(qt_$(host_os)_packages) $(qt_$(host_arch)_$(host_os)_packages)
 wallet_packages_$(NO_WALLET) = $(wallet_packages)
 upnp_packages_$(NO_UPNP) = $(upnp_packages)
+zmq_packages_$(NO_ZMQ) = $(zmq_packages)
 
 rapidcheck_packages_$(RAPIDCHECK) = $(rapidcheck_packages)
 
@@ -103,6 +105,10 @@ ifneq ($(qt_packages_),)
 native_packages += $(qt_native_packages)
 endif
 
+ifneq ($(zmq_packages_),)
+packages += $(zmq_packages)
+endif
+
 ifeq ($(rapidcheck_packages_),)
 packages += $(rapidcheck_packages)
 endif
@@ -143,6 +149,7 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -e 's|@LDFLAGS@|$(strip $(host_LDFLAGS) $(host_$(release_type)_LDFLAGS))|' \
             -e 's|@allow_host_packages@|$(ALLOW_HOST_PACKAGES)|' \
             -e 's|@no_qt@|$(NO_QT)|' \
+            -e 's|@no_zmq@|$(NO_ZMQ)|' \
             -e 's|@no_wallet@|$(NO_WALLET)|' \
             -e 's|@no_upnp@|$(NO_UPNP)|' \
             -e 's|@debug@|$(DEBUG)|' \