Not for merge.

--- a/dev-ruby/ffi/ffi-1.15.5.ebuild
+++ b/dev-ruby/ffi/ffi-1.15.5.ebuild
@@ -47,6 +47,9 @@
 
 	# Remove bundled version of libffi.
 	rm -rf ext/ffi_c/libffi || die
+
+	# For testing #847286
+	rm -rf lib/ffi/platform/* || die
 }
 
 each_ruby_compile() {