[glib/wip/pwithnall/thread-settings-fixes] gthread: Ensure GThreadSchedulerSettings is always defined

[Philip Withnall <pwithnall src gnome org>]

commit 30c8eb85ab90df3c639bd37f37a688542f35de66
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Jan 20 14:39:52 2020 +0000

    gthread: Ensure GThreadSchedulerSettings is always defined
    
    It’s now used unconditionally for `shared_thread_scheduler_settings` in
    `gthreadpool.c`, so it actually needs to have a storage definition.
    
    Fixes a build failure on FreeBSD.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 glib/gthreadprivate.h | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)
---
diff --git a/glib/gthreadprivate.h b/glib/gthreadprivate.h
index afbe75934..888b3766d 100644
--- a/glib/gthreadprivate.h
+++ b/glib/gthreadprivate.h
@@ -39,26 +39,18 @@ struct  _GRealThread
 /* system thread implementation (gthread-posix.c, gthread-win32.c) */
 
 /* Platform-specific scheduler settings for a thread */
-typedef struct _GThreadSchedulerSettings GThreadSchedulerSettings;
-
-/* TODO: Add the same for macOS and the BSDs */
-#if defined(HAVE_SYS_SCHED_GETATTR)
-/* This is for modern Linux */
-struct _GThreadSchedulerSettings
+typedef struct
 {
+#if defined(HAVE_SYS_SCHED_GETATTR)
+  /* This is for modern Linux */
   struct sched_attr *attr;
-};
-
-#define HAVE_GTHREAD_SCHEDULER_SETTINGS 1
-
 #elif defined(G_OS_WIN32)
-struct _GThreadSchedulerSettings
-{
   gint thread_prio;
-};
-
-#define HAVE_GTHREAD_SCHEDULER_SETTINGS 1
+#else
+  /* TODO: Add support for macOS and the BSDs */
+  void *dummy;
 #endif
+} GThreadSchedulerSettings;
 
 void            g_system_thread_wait            (GRealThread  *thread);