hg: jdk/jdk13: 8226538: find-files.gmk gets corrupted if tab completion is used before running make first

[erik.joelsson at oracle.com]

Changeset: 68ef70c9a921
Author:    erikj
Date:      2019-06-21 06:33 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk13/rev/68ef70c9a921

8226538: find-files.gmk gets corrupted if tab completion is used before running make first
Reviewed-by: tbell

! make/common/FindTests.gmk
! test/make/TestMake.gmk