Remove -race test flag to build on OpenBSD (#883)
Remove -race test flag to build on OpenBSD (#883)

Without this change, running 'gmake' as the documentation does not finish the
build process to produce the binary.

Signed-off-by: Zach Leslie <9807661c45598260511cb9cecb824417ce847eb7@gmail.com>
derekmarcotte/node_exporter,siavashs/node_exporter,derekmarcotte/node_exporter,siavashs/node_exporter,siavashs/node_exporter,derekmarcotte/node_exporter,prometheus/node_exporter,prometheus/node_exporter,derekmarcotte/node_exporter,siavashs/node_exporter,prometheus/node_exporter