devel/bazel8: fix crash due to missing JNI stub on BSD

Add a stub for SystemNetworkStats_getNetIoCountersNative in
unix_jni_bsd.cc. This symbol is required on non-Linux platforms
when JNI is available; its absence caused an UnsatisfiedLinkError
crash at runtime. Bump PORTREVISION.

PR: 294865
Reported by: Ken DEGUCHI <kdeguchi@sz.tokoha-u.ac.jp>