hg: jdk/submit: 8210150: Allow custom-hook.m4 to include files from CUSTOM_CONFIG_DIR

[magnus.ihse.bursie at oracle.com]

Changeset: c25f6c562bf5
Author:    ihse
Date:      2018-08-30 08:15 +0200
URL:       http://hg.openjdk.java.net/jdk/submit/rev/c25f6c562bf5

8210150: Allow custom-hook.m4 to include files from CUSTOM_CONFIG_DIR
Reviewed-by: erikj

! make/autoconf/configure