fftools: drop unused/hacky macros

Having macros initialize local variables seems strange to me, and there
are no more current users of these macros. (The one that was commented
out was incorrect anyway, since the macro has changed in the meantime)

fftools/cmdutils.h

@@ -530,19 +530,6 @@ void *allocate_array_elem(void *array, size_t elem_size, int *nb_elems);
 #define GROW_ARRAY(array, nb_elems)\
     grow_array((void**)&array, sizeof(*array), &nb_elems, nb_elems + 1)
 
-#define GET_PIX_FMT_NAME(pix_fmt)\
-    const char *name = av_get_pix_fmt_name(pix_fmt);
-
-#define GET_CODEC_NAME(id)\
-    const char *name = avcodec_descriptor_get(id)->name;
-
-#define GET_SAMPLE_FMT_NAME(sample_fmt)\
-    const char *name = av_get_sample_fmt_name(sample_fmt)
-
-#define GET_SAMPLE_RATE_NAME(rate)\
-    char name[16];\
-    snprintf(name, sizeof(name), "%d", rate);
-
 double get_rotation(const int32_t *displaymatrix);
 
 /* read file contents into a string */

fftools/ffmpeg_filter.c

@@ -416,7 +416,7 @@ static void choose_ ## name (OutputFilterPriv *ofp, AVBPrint *bprint)          \
 }
 
 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
-//                  GET_PIX_FMT_NAME)
+//                  av_get_pix_fmt_name)
 
 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
                   AV_SAMPLE_FMT_NONE, "%s", av_get_sample_fmt_name)