net-im/libsignal: fix build on powerpc64*
ring-sys 5.0.2] /wrkdirs/usr/ports/net-im/libsignal/work/target/release/build/boring-sys-ef33d39251a122cc/out/boringssl/crypto/fipsmodule/../internal.h:230:2: error: "Must define either OPENSSL_32_BIT or OPENSSL_64_BIT"