RFR: 8261109: [macOS] Remove disabled warning for JNF in make/autoconf/flags-cflags.m4 [v2]

[Phil Race]

On Thu, 4 Feb 2021 11:42:48 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Phil Race has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove condition that should have been fixed as part of 8257858
>
> Marked as reviewed by ihse (Reviewer).

Magnus pointed out a condition that I think should have been removed in the fix for
8257858 : Remove JNF dependency from libosxsecurity/KeystoreImpl.m

since its a build related change too, and I've verified that after removing it we still build, I am rolling it in here, if that's OK with folks

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