build: remove timestamps from then antlr output
build: remove timestamps from then antlr output

The output of antrl always has the timestamp of when it was
created. This expands the existing sed hack to remove that too.

Signed-off-by: Rafael Ávila de Espíndola <1975039f9046bf513b77c0c5639a0efc25f00e7f@scylladb.com>

scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla