vcpkg/ports/grpc/00012-fix-use-cxx17.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4573027..4615602 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -271,6 +271,12 @@ include(cmake/upb.cmake)
 include(cmake/xxhash.cmake)
 include(cmake/zlib.cmake)
 
+ 
+if (ABSL_USE_CXX17)
+    message(STATUS "Found absl uses CXX17, enable CXX17 feature.")
+    set(CMAKE_CXX_STANDARD 17)
+endif()
+
 if(_gRPC_PLATFORM_MAC OR _gRPC_PLATFORM_IOS)
   set(_gRPC_ALLTARGETS_LIBRARIES ${CMAKE_DL_LIBS} m pthread)
 elseif(_gRPC_PLATFORM_ANDROID)