build: allow NO_LIBEVENT=1 in depends

depends/Makefile

@@ -33,6 +33,7 @@ WORK_PATH = $(BASEDIR)/work
 BASE_CACHE ?= $(BASEDIR)/built
 SDK_PATH ?= $(BASEDIR)/SDKs
 NO_BOOST ?=
+NO_LIBEVENT ?=
 NO_QT ?=
 NO_QR ?=
 NO_BDB ?=
@@ -149,6 +150,9 @@ build_id:=$(shell env CC='$(build_CC)' C_STANDARD='$(C_STANDARD)' CXX='$(build_C
 $(host_arch)_$(host_os)_id:=$(shell env CC='$(host_CC)' C_STANDARD='$(C_STANDARD)' CXX='$(host_CXX)' CXX_STANDARD='$(CXX_STANDARD)' AR='$(host_AR)' RANLIB='$(host_RANLIB)' STRIP='$(host_STRIP)' SHA256SUM='$(build_SHA256SUM)' DEBUG='$(DEBUG)' LTO='$(LTO)' ./gen_id '$(HOST_ID_SALT)' 'GUIX_ENVIRONMENT=$(realpath $(GUIX_ENVIRONMENT))')
 
 boost_packages_$(NO_BOOST) = $(boost_packages)
+
+libevent_packages_$(NO_LIBEVENT) = $(libevent_packages)
+
 qrencode_packages_$(NO_QR) = $(qrencode_$(host_os)_packages)
 
 qt_packages_$(NO_QT) = $(qt_packages) $(qt_$(host_os)_packages) $(qt_$(host_arch)_$(host_os)_packages) $(qrencode_packages_)
@@ -164,7 +168,7 @@ zmq_packages_$(NO_ZMQ) = $(zmq_packages)
 multiprocess_packages_$(MULTIPROCESS) = $(multiprocess_packages)
 usdt_packages_$(NO_USDT) = $(usdt_$(host_os)_packages)
 
-packages += $($(host_arch)_$(host_os)_packages) $($(host_os)_packages) $(boost_packages_) $(qt_packages_) $(wallet_packages_) $(upnp_packages_) $(natpmp_packages_) $(usdt_packages_)
+packages += $($(host_arch)_$(host_os)_packages) $($(host_os)_packages) $(boost_packages_) $(libevent_packages_) $(qt_packages_) $(wallet_packages_) $(upnp_packages_) $(natpmp_packages_) $(usdt_packages_)
 native_packages += $($(host_arch)_$(host_os)_native_packages) $($(host_os)_native_packages)
 
 ifneq ($(zmq_packages_),)

depends/packages/packages.mk

@@ -1,7 +1,9 @@
-packages:= libevent
+packages:=
 
 boost_packages = boost
 
+libevent_packages = libevent
+
 qrencode_linux_packages = qrencode
 qrencode_android_packages = qrencode
 qrencode_darwin_packages = qrencode