hg: jdk10/jdk10: 8181147: JNU_GetStringPlatformChars should have a fast path for UTF-8

[claes.redestad at oracle.com]

Changeset: d67a3f1f057f
Author:    redestad
Date:      2017-06-19 10:32 +0200
URL:       http://hg.openjdk.java.net/jdk10/jdk10/rev/d67a3f1f057f

8181147: JNU_GetStringPlatformChars should have a fast path for UTF-8
Reviewed-by: martin, erikj, sherman, chegar, mikael

! make/Main.gmk
! make/jprt.properties