Properly declare getNextWakeupUsecs(), even on non-macs

[LinqLover]

This was another bug that clang 14 apparently treated as a warning, but clang 18 treats is as an error.

[Copilot]

🟡 Changes recommended

The new sq.h declaration uses an empty parameter list (getNextWakeupUsecs()), which is not a strict C prototype and can still trigger Clang -Wstrict-prototypes errors.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR centralizes the declaration of getNextWakeupUsecs into the shared cross-platform header to avoid Clang 18 build failures caused by missing/incorrect function prototypes.

Changes:

• Removed per-function extern usqLong getNextWakeupUsecs... declarations from multiple Unix/iOS heartbeat-related call sites.
• Added a getNextWakeupUsecs declaration to platforms/Cross/vm/sq.h so all platforms see a consistent prototype.

File summaries

File	Description
platforms/unix/vm/sqUnixITimerTickerHeartbeat.c	Removes local getNextWakeupUsecs forward declaration in favor of the shared header.
platforms/unix/vm/sqUnixITimerHeartbeat.c	Same: relies on header prototype instead of local extern.
platforms/unix/vm/sqUnixHeartbeat.c	Same: removes local extern declaration to use shared header.
platforms/unix/vm-display-X11/sqUnixX11.c	Same: removes local extern ... (void) declaration in the X11 display heartbeat path.
platforms/unix/vm-display-null/sqUnixDisplayNull.c	Same: removes local extern ... (void) declaration in the null-display path.
platforms/unix/misc/threadValidate/sqUnixHeartbeat.c	Same: removes local extern declaration in thread validation build.
platforms/minheadless/unix/sqUnixHeartbeat.c	Same: removes local extern declaration in minheadless build.
platforms/iOS/vm/Common/Classes/sqMacV2Time.c	Same: removes local extern ... (void) declaration from iOS time code.
platforms/Cross/vm/sq.h	Adds a shared declaration for getNextWakeupUsecs (but should be a strict prototype).

Review details

• Files reviewed: 9/9 changed files
• Comments generated: 1
• Review effort level: Lite

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