devel/php-grpc: add powerpc64* support
/wrkdirs/usr/ports/devel/php-grpc/work-php82/grpc-php-ext-1.83.0/third_party/boringssl-with-bazel/include/openssl/target.h:74:2: error: "Unknown target CPU"
74 | #error "Unknown target CPU" | ^
1 error generated.