update cmake

cmake/absl.cmake

@@ -0,0 +1,19 @@
+set(ABSL_PROPAGATE_CXX_STD ON)
+set(ABSL_CXX_STANDARD 17)
+set(ABSL_USE_GOOGLETEST_HEAD ON)
+set(ABSL_ENABLE_INSTALL ON)
+set(
+  ABSL_TARGETS   
+  absl::strings
+  absl::flags
+  absl::status
+  absl::statusor
+  absl::examine_stack
+  absl::stacktrace
+  absl::base
+  absl::config
+  absl::core_headers
+  absl::raw_logging_internal
+  absl::failure_signal_handler
+  absl::flat_hash_map
+)