gentoo-overlay/dev-libs/libffi/files/libffi-3.1-execstack.patch

https://bugs.gentoo.org/511634
https://sourceware.org/ml/libffi-discuss/2014/msg00058.html

--- src/x86/win32.S
+++ src/x86/win32.S
@@ -1304,3 +1304,6 @@
 
 #endif /* !_MSC_VER */
 
+#if defined __ELF__ && defined __linux__
+	.section        .note.GNU-stack,"",@progbits
+#endif