Fix Android not being detected with latest NDK toolchain (#458)
When using the NDK 13b toolchain standalone or with CMake, ANDROID is not defined,
but __ANDROID__ is defined instead.
diff --git a/fmt/format.h b/fmt/format.h
index db8e79c..1f5fa26 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -2924,7 +2924,7 @@
case 'n': {
unsigned num_digits = internal::count_digits(abs_value);
fmt::StringRef sep = "";
-#ifndef ANDROID
+#if !(defined(ANDROID) || defined(__ANDROID__))
sep = internal::thousands_sep(std::localeconv());
#endif
unsigned size = static_cast<unsigned>(
