TBR: mojo.shared: Replace "v23" (the tool name) with "jiri".

MultiPart: 9/17
Change-Id: I380564228357ac6f48d91bd152b4af9b26c66d5d
diff --git a/mojo.mk b/mojo.mk
index f0cd518..18c4faa 100644
--- a/mojo.mk
+++ b/mojo.mk
@@ -4,6 +4,7 @@
 
 SHELL := /bin/bash -euo pipefail
 V23_GOPATH := $(shell echo `v23 run env | grep GOPATH | cut -d\= -f2`)
+
 ifdef ANDROID
 	# Configure compiler and linker for Android.
 	export GOROOT := $(MOJO_DIR)/src/third_party/go/tool/android_arm