Use use_homebrew in znc-buildmod

CMakeLists.txt

@@ -438,6 +438,7 @@ write_basic_package_version_file("ZNCConfigVersion.cmake"
 	COMPATIBILITY AnyNewerVersion)
 install(FILES
 	"${PROJECT_SOURCE_DIR}/cmake/CMakeFindDependencyMacroPC.cmake"
+	"${PROJECT_SOURCE_DIR}/cmake/use_homebrew.cmake"
 	"${PROJECT_BINARY_DIR}/ZNCConfig.cmake"
 	"${PROJECT_BINARY_DIR}/ZNCConfigVersion.cmake"
 	DESTINATION "${CMAKE_INSTALL_DATADIR}/znc/cmake")

ZNCConfig.cmake.in

@@ -16,6 +16,7 @@
 
 include(CMakeFindDependencyMacro)
 include("${CMAKE_CURRENT_LIST_DIR}/CMakeFindDependencyMacroPC.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/use_homebrew.cmake")
 @ZNC_CMAKE_FIND_DEPS@
 
 include("${CMAKE_CURRENT_LIST_DIR}/znc_internal.cmake")