Removed unused var from makefile

Author: percona-csalguero

Makefile

@@ -4,7 +4,6 @@ VERSION ?=$(shell git describe --abbrev=0)
 BUILD ?=$(shell date +%FT%T%z)
 GOVERSION ?=$(shell go version | cut --delimiter=" " -f3)
 COMMIT ?=$(shell git rev-parse HEAD)
-SOMEVAR ?=$(shell git rev-parse HEAD)
 BRANCH ?=$(shell git rev-parse --abbrev-ref HEAD)
 
 PREFIX=$(shell pwd)