Debian build: fixed libperseus build (4)

devices/CMakeLists.txt

@@ -6,6 +6,7 @@ if (BUILD_DEBIAN)
     add_subdirectory(bladerf)
     add_subdirectory(hackrf)
     add_subdirectory(limesdr)
+    add_subdirectory(perseus)
     add_subdirectory(plutosdr)
 else(BUILD_DEBIAN)
     find_package(LibBLADERF)