git: openjdk/mobile: 8234809: set relro in linker flags when building with gcc

[duke]

Changeset: bdd67c46
Author:    Matthias Baesken <mbaesken at openjdk.org>
Date:      2019-11-26 13:55:11 +0000
URL:       https://git.openjdk.java.net/mobile/commit/bdd67c46

8234809: set relro in linker flags when building with gcc

Reviewed-by: erikj, fweimer

! make/autoconf/flags-ldflags.m4