Define GNU_SOURCE for Redis BUILD file
Define GNU_SOURCE for Redis BUILD file

Without this flag, flock definition and related flags are not included,
which causes compile errors in cluster.c

PiperOrigin-RevId: 311817157
Change-Id: I67df64ba3b9ab4ae4f73d627ca6e5005d93a274b

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo