RFR: 8261109: [macOS] Remove disabled warning for JNF in make/autoconf/flags-cflags.m4

[Magnus Ihse Bursie]

On Thu, 4 Feb 2021 02:32:31 GMT, Phil Race <prr at openjdk.org> wrote:

> remove un-needed disabling now JNF has gone ..

Marked as reviewed by ihse (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2396