message: Silence implicit-function-declaration warning in libminijail build
  The standard ndk flags do not set C99. Turn of implicit declaration
  warnings for gethostname.
diff: @@ -18,6 +18,7 @@ fn main() {
  cc::Build::new()
  .define("ALLOW_DEBUG_LOGGING", "1")
  .define("PRELOADPATH", "\"invalid\"")
  + .flag("-Wno-implicit-function-declaration")
  .file(format!("libminijail/{}/libconstants.gen.c", target_os_dir))
  .file(format!("libminijail/{}/libsyscalls.gen.c", target_os_dir))
  .file("libminijail/bpf.c")
  