RFR: 8317696: Fix compilation with clang-16 [v3]

[Jan Kratochvil]

On Tue, 10 Oct 2023 20:37:07 GMT, Phil Race <prr at openjdk.org> wrote:

>> src/java.desktop/unix/native/common/awt/awt_GraphicsEnv.h line 53:
>> 
>>> 51: #define MITSHM_PERM_OWNER  (0600)
>>> 52: 
>>> 53: extern int XShmQueryExtension(Display* dpy);
>> 
>> I wonder if it's even needed here: the declaration should come from `X11/extensions/XShm.h` which is included.
>
> I agree, but I wonder why it was ever added ? Near as I can tell its been there since the SHM code was added in 1.4

So I have removed the declaration.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16092#discussion_r1354546381