www/monolith: fix build
- Perl and gmake are necessary for openssl-sys build.
- Allow to use libatomic on powerpc: = note: ld: error: undefined symbol: __atomic_is_lock_free >>> referenced by threads_pthread.c >>> libcrypto-lib-threads_pthread.o:(CRYPTO_atomic_or) in archive /wrkdirs/usr/ports/www/monolith/work/target/release/deps/libopenssl_sys-049131838f14b8ea.rlib >>> referenced by threads_pthread.c >>> libcrypto-lib-threads_pthread.o:(CRYPTO_atomic_load) in archive /wrkdirs/usr/ports/www/monolith/work/target/release/deps/libopenssl_sys-049131838f14b8ea.rlib