meson: install radangeld

radangeld/meson.build

 zmqpp_dep = dependency('libzmqpp')
 libsystemd_dep = dependency('libsystemd')
 
-executable('radangeld', 'main.cpp', dependencies : [hidapi_usb_dep, boost_dep, libconfigpp_dep, libsystemd_dep, thread_dep, zmqpp_dep, tz_dep])
+executable('radangeld', 'main.cpp', dependencies : [hidapi_usb_dep, boost_dep, libconfigpp_dep, libsystemd_dep, thread_dep, zmqpp_dep, tz_dep], install : true)