CrashHandler: Use libbacktrace

CMakeModules/FindLibbacktrace.cmake

@@ -0,0 +1,31 @@
+# - Try to find libbacktrace
+# Once done this will define
+#  LIBBACKTRACE_FOUND - System has libbacktrace
+#  LIBBACKTRACE_INCLUDE_DIRS - The libbacktrace include directories
+#  LIBBACKTRACE_LIBRARIES - The libraries needed to use libbacktrace
+
+FIND_PATH(
+    LIBBACKTRACE_INCLUDE_DIR backtrace.h
+    HINTS /usr/include /usr/local/include
+    ${LIBBACKTRACE_PATH_INCLUDES}
+)
+
+FIND_LIBRARY(
+    LIBBACKTRACE_LIBRARY
+    NAMES backtrace
+    PATHS ${ADDITIONAL_LIBRARY_PATHS} ${LIBBACKTRACE_PATH_LIB}
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Libbacktrace DEFAULT_MSG
+                                  LIBBACKTRACE_LIBRARY LIBBACKTRACE_INCLUDE_DIR)
+
+if(LIBBACKTRACE_FOUND)
+    add_library(libbacktrace::libbacktrace UNKNOWN IMPORTED)
+    set_target_properties(libbacktrace::libbacktrace PROPERTIES
+        IMPORTED_LOCATION ${LIBBACKTRACE_LIBRARY}
+        INTERFACE_INCLUDE_DIRECTORIES ${LIBBACKTRACE_INCLUDE_DIR}
+    )
+endif()
+
+mark_as_advanced(LIBBACKTRACE_INCLUDE_DIR LIBBACKTRACE_LIBRARY)