lswr: take const AVChannelLayout* in swr_alloc_set_opts2()

This is fully backwards-compatible in both ABI and API,
so it's only a minor bump.

libswresample/swresample.c

@@ -83,8 +83,8 @@ FF_ENABLE_DEPRECATION_WARNINGS
 #endif
 
 int swr_alloc_set_opts2(struct SwrContext **ps,
-                        AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
-                        AVChannelLayout *in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
+                        const AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
+                        const AVChannelLayout *in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                         int log_offset, void *log_ctx) {
     struct SwrContext *s = *ps;
     int ret;

libswresample/swresample.h

@@ -286,8 +286,8 @@ struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
  *         On error, the Swr context is freed and *ps set to NULL.
  */
 int swr_alloc_set_opts2(struct SwrContext **ps,
-                        AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
-                        AVChannelLayout *in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
+                        const AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
+                        const AVChannelLayout *in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                         int log_offset, void *log_ctx);
 /**
  * @}

libswresample/version.h

@@ -30,7 +30,7 @@
 
 #include "version_major.h"
 
-#define LIBSWRESAMPLE_VERSION_MINOR   8
+#define LIBSWRESAMPLE_VERSION_MINOR   9
 #define LIBSWRESAMPLE_VERSION_MICRO 100
 
 #define LIBSWRESAMPLE_VERSION_INT  AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \