message: Update C++ flags
diff: @@ -106,6 +106,7 @@ buildscript {
  }
  ext.cmakeArgs = [
  + "--no-warn-unused-cli",
  "-DANDROID_PIE=ON",
  "-DANDROID_PLATFORM=21",
  "-DANDROID_STL=c++_static",
  @@ -117,8 +118,6 @@ buildscript {
  ext.cppFlags = [
  "-std=c++17",
  - "-Wno-unused-command-line-argument",
  - "-Wl,--hash-style=both", // Required to support API levels below 23
  "-fno-stack-protector",
  "-fno-exceptions",
  "-fno-unwind-tables",
  @@ -131,8 +130,13 @@ buildscript {
  "-fomit-frame-pointer",
  "-ffunction-sections",
  "-fdata-sections",
  + "-no-canonical-prefixes",
  + "-Wformat",
  + "-Werror=format-security",
  + "-Wno-unused-command-line-argument",
  "-Wl,--gc-sections",
  "-Wl,-Bsymbolic-functions",
  + "-Wl,--hash-style=both", // Required to support API levels below 23
  ]
  ext.abis = abis
  