message: android-arm64-config.jam update
  - cleanup
  - cxxflags on top, linkflags at the bottom
diff: @@ -6,14 +6,17 @@ ANDROID_API = [ os.environ android_api ] ;
  using clang : arm64 : $(ANDROID_TOOLCHAIN)/bin/aarch64-linux-android$(ANDROID_API)-clang++ :
  <cxxflags>-fPIC
  <cxxflags>-march=armv8-a+crc
  - <cxxflags>-std=c++14
  + <cxxflags>-std=c++17
  <cxxflags>-DANDROID
  <cxxflags>-fno-strict-aliasing
  <cxxflags>-fvisibility=hidden
  - <linkflags>-static-libstdc++
  + <cxxflags>-D_FORTIFY_SOURCE=2
  + <cxxflags>-fstack-protector-strong
  # debug information
  <cxxflags>-g
  - <cxxflags>-gdwarf-4
  - <cxxflags>-fdebug-macro
  - <cxxflags>-ggdb
  + <linkflags>-static-libstdc++
  + <linkflags>-fuse-ld=lld
  + <linkflags>-Wl,--build-id=sha1
  + # remove when API >= 29
  + <linkflags>-Wl,--no-rosegment
  ;
  