add explicit check for setcap binary when doing setcap so when it's missing it's not a nop / silent failure

daemon/CMakeLists.txt

@@ -37,7 +37,9 @@ else()
     if(CMAKE_SYSTEM_NAME MATCHES "Linux")
         option(WITH_SETCAP "Enables setcap'ing the lokinet binary with the required capabilities during installation (requires root)" ON)
         if(WITH_SETCAP)
-            install(CODE "execute_process(COMMAND setcap cap_net_admin,cap_net_bind_service=+eip ${CMAKE_INSTALL_PREFIX}/bin/lokinet)")
+          find_program(setcap_bin NAMES setcap HINTS /sbin /usr/sbin REQUIRED)
+          message(STATUS "found setcap: ${setcap_bin}")
+          install(CODE "execute_process(COMMAND ${setcap_bin} cap_net_admin,cap_net_bind_service=+eip ${CMAKE_INSTALL_PREFIX}/bin/lokinet)")
         endif()
     endif()