virtual/libffi has a single dev-libs/libffi provider. Let's use that.
Closes: https://bugs.gentoo.org/699796
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
#--- END OF EXAMPLES ---
+# Sergei Trofimovich <slyfox@gentoo.org> (2020-02-22)
+# virtual/libffi has only one dev-libs/libffi provider. Use that instead.
+# bug #699796.
+virtual/libffi
+
# Jason A. Donenfeld <zx2c4@gentoo.org> (2019-12-30)
# Directly install net-vpn/wireguard-tools and net-vpn/wireguard-modules.
# This may be accomplished by running: