RFR: 8295211: Fix autoconf 2.71 warning "AC_CHECK_HEADERS: you should use literals"

[Aleksey Shipilev]

On Wed, 12 Oct 2022 10:23:13 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> In autoconf 2.71, there is a warning generated for calling AC_CHECK_HEADERS with a variable.
> 
> It is not clear to me why they consider this to be a problem, but the warning is printed whenever you run configure with autoconf 2.71 or newer, and it is annoying.
> 
> We're only doing this in one place. Let's hardcode the values instead so we get rid of the warning.

Looks okay to me.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10672