Fix build failure when using clang for Android clang for Android generates __gnu_linux__ define, but gcc for Android doesn't. So we should add check it for Android
diff --git a/src/closures.c b/src/closures.c
index 6298d6f..557c736 100644
--- a/src/closures.c
+++ b/src/closures.c
@@ -34,7 +34,7 @@
#include <ffi_common.h>
#if !FFI_MMAP_EXEC_WRIT && !FFI_EXEC_TRAMPOLINE_TABLE
-# if __gnu_linux__
+# if __gnu_linux__ && !defined(__ANDROID__)
/* This macro indicates it may be forbidden to map anonymous memory
with both write and execute permission. Code compiled when this
option is defined will attempt to map such pages once, but if it