git: openjdk/jdk16u: 8259949: x86 32-bit build fails when -fcf-protection is passed in the compiler flags

[Andrew John Hughes]

Changeset: 189fe433
Author:    Andrew John Hughes <andrew at openjdk.org>
Date:      2021-03-04 19:48:41 +0000
URL:       https://git.openjdk.java.net/jdk16u/commit/189fe433

8259949: x86 32-bit build fails when -fcf-protection is passed in the compiler flags

Use -march=i686 instead of -march=i586 if -fcf-protection is passed to the build as CMOV is required

Backport-of: 0785147460934ee2aa413ab7872837094824bd3d

! make/autoconf/flags-cflags.m4