File link-backward-to-libdw.patch of Package anbox

--- a/external/backward-cpp/CMakeLists.txt	2019-09-21 18:36:51.941483629 -0700
+++ b/external/backward-cpp/CMakeLists.txt	2019-09-21 18:44:20.041597471 -0700
@@ -77,6 +77,8 @@
 add_library(backward ${libtype} backward.cpp)
 target_compile_definitions(backward PUBLIC ${BACKWARD_DEFINITIONS})
 target_include_directories(backward PUBLIC ${BACKWARD_INCLUDE_DIRS})
+target_link_libraries(backward PUBLIC -ldw)
+
 
 ###############################################################################
 # TESTS