TBR: Replace "v23" tool with "jiri" tool.

PresubmitTest: none
Change-Id: I8bc837a19df675f616a5c190c62d34278adf8ae9
diff --git a/mojo.mk b/mojo.mk
index 18c4faa..7feab96 100644
--- a/mojo.mk
+++ b/mojo.mk
@@ -3,7 +3,7 @@
 # license that can be found in the LICENSE file.
 
 SHELL := /bin/bash -euo pipefail
-V23_GOPATH := $(shell echo `v23 run env | grep GOPATH | cut -d\= -f2`)
+V23_GOPATH := $(shell echo `jiri run env | grep GOPATH | cut -d\= -f2`)
 
 ifdef ANDROID
 	# Configure compiler and linker for Android.
@@ -86,6 +86,6 @@
 endif
 ifdef ANDROID
 ifeq ($(wildcard $(ANDROID_NDK)),)
-	$(error ERROR: $(ANDROID_NDK) does not exist.  Please install android profile with "v23 profile install android")
+	$(error ERROR: $(ANDROID_NDK) does not exist.  Please install android profile with "jiri profile install android")
 endif
 endif