Move libsinsp to a cmake module

Signed-off-by: Grzegorz Nosek <grzegorz.nosek@sysdig.com>

CMakeLists.txt

@@ -56,4 +56,4 @@ set(PACKAGE_NAME "sysdig")
 
 include(CompilerFlags)
 include(libscap)
-add_subdirectory(userspace/libsinsp)
+include(libsinsp)

cmake/modules/libsinsp.cmake

@@ -0,0 +1,23 @@
+if(NOT HAVE_LIBSINSP)
+set(HAVE_LIBSINSP On)
+
+if(NOT LIBSINSP_DIR)
+	get_filename_component(LIBSINSP_DIR ${CMAKE_CURRENT_LIST_DIR}/../.. ABSOLUTE)
+endif()
+
+option(USE_BUNDLED_DEPS "Enable bundled dependencies instead of using the system ones" ON)
+
+include(ExternalProject)
+include(libscap)
+include(tbb)
+include(jsoncpp)
+
+set(LIBSINSP_INCLUDE_DIRS ${LIBSINSP_DIR}/userspace/libsinsp ${LIBSCAP_INCLUDE_DIRS} ${DRIVER_CONFIG_DIR})
+get_filename_component(TBB_ABSOLUTE_INCLUDE_DIR ${TBB_INCLUDE_DIR} ABSOLUTE)
+list(APPEND LIBSINSP_INCLUDE_DIRS ${TBB_ABSOLUTE_INCLUDE_DIR})
+get_filename_component(JSONCPP_ABSOLUTE_INCLUDE_DIR ${JSONCPP_INCLUDE} ABSOLUTE)
+list(APPEND LIBSINSP_INCLUDE_DIRS ${JSONCPP_ABSOLUTE_INCLUDE_DIR})
+
+add_subdirectory(${LIBSINSP_DIR}/userspace/libsinsp ${CMAKE_BINARY_DIR}/libsinsp)
+
+endif()