Fix stub qt_jspi_resume_js() return value

Return bool for the dynamic linking stub, like the
actual function.

Change-Id: I0e0daeac3d647055fecb7930f9ed8e6f9f574bb5
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

src/corelib/kernel/qeventdispatcher_wasm.cpp

@@ -133,9 +133,10 @@ void qt_jspi_suspend_js()
     Q_UNREACHABLE();
 }
 
-void qt_jspi_resume_js()
+bool qt_jspi_resume_js()
 {
     Q_UNREACHABLE();
+    return false;
 }
 
 bool qt_jspi_can_resume_js()