avutil/cpu: Deprecate AV_CPU_FLAG_FORCE

This flag does nothing since the deactivation of
the dsp_mask field of AVCodecContext in
commits 9ae6ba2883 and
9ae6ba2883 (it has
been superseded with better ways to override the CPU flags).
So deprecate it.

Reviewed-by: Lynne <dev@lynne.ee>
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
 
 API changes, most recent first:
 
+2025-11-16 - xxxxxxxxxx - lavu 60.18.100 - cpu.h
+  Deprecate AV_CPU_FLAG_FORCE without replacement.
+
 2025-11-01 - xxxxxxxxxx - lavc 62.19.100 - avcodec.h
   Schedule AVCodecParser and av_parser_init() to use enum AVCodecID
   for codec ids on the next major version bump.

libavutil/cpu.h

@@ -24,7 +24,9 @@
 #include <stddef.h>
 #include "version.h"
 
-#define AV_CPU_FLAG_FORCE    0x80000000 /* force usage of selected flags (OR) */
+#if FF_API_CPU_FLAG_FORCE
+#define AV_CPU_FLAG_FORCE    0x80000000 /* @deprecated, should not be used */
+#endif
 
     /* lower 16 bits - CPU features */
 #define AV_CPU_FLAG_MMX          0x0001 ///< standard MMX

libavutil/version.h

@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  60
-#define LIBAVUTIL_VERSION_MINOR  17
+#define LIBAVUTIL_VERSION_MINOR  18
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
@@ -110,6 +110,7 @@
 #define FF_API_VULKAN_FIXED_QUEUES      (LIBAVUTIL_VERSION_MAJOR < 61)
 #define FF_API_OPT_INT_LIST             (LIBAVUTIL_VERSION_MAJOR < 61)
 #define FF_API_OPT_PTR                  (LIBAVUTIL_VERSION_MAJOR < 61)
+#define FF_API_CPU_FLAG_FORCE           (LIBAVUTIL_VERSION_MAJOR < 61)
 
 /**
  * @}