When building for Android, _GNU_SOURCE will be defined:
/home/ubuntu/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang++ -dM -E -x c++ - < /dev/null
#define _GNU_SOURCE 1
#define _LP64 1
#define __AARCH64EL__ 1
#define __AARCH64_CMODEL_SMALL__ 1
#define __ANDROID_API__ 30
#define __ANDROID__ 1
#define __ARM_64BIT_STATE 1
.....
but it doesn't have the fopencookie() function, or define the cookie_io_functions_t type, which results in compile failures:
In file included from test/fuzz/addition_overflow.cpp:7:
./test/fuzz/util.h:388:15: error: unknown type name 'cookie_io_functions_t'
const cookie_io_functions_t io_hooks = {
^
15 warnings and 1 error generated.
Just skip trying to use it if we are building for Android. Should fix #22062.
