Include bazel.mk in email/Makefile

I get a "make: run: No such file or directory" without this.

Bug: skia:13284
Change-Id: I78a8d8b517937910a3b7387069692ef0a3278ac5
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/553536
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
diff --git a/email/Makefile b/email/Makefile
index e867910..9e391b3 100644
--- a/email/Makefile
+++ b/email/Makefile
@@ -1,3 +1,5 @@
+include ../make/bazel.mk
+
 run-local-instance:
 	go install ./cmd/...
 	emailservice --local