Revert "cmdutils: allow specifying the file for -report"

This reverts commit 841bf0ef.
This does not fully work as the file is used before the filename is parsed
so not all information is written in the specified file.

cmdutils.c

@@ -528,17 +528,6 @@ int opt_loglevel(void *optctx, const char *opt, const char *arg)
     return 0;
 }
 
-int opt_report_file(void *optctx, const char *opt, const char *arg)
-{
-    report_file = fopen(arg, "w");
-    if (!report_file) {
-        av_log(NULL, AV_LOG_ERROR, "Failed to open report \"%s\": %s\n",
-               arg, strerror(errno));
-        return AVERROR(errno);
-    }
-    return 0;
-}
-
 int opt_report(const char *opt)
 {
     char filename[64];

cmdutils.h

@@ -84,8 +84,6 @@ int opt_loglevel(void *optctx, const char *opt, const char *arg);
 
 int opt_report(const char *opt);
 
-int opt_report_file(void *optctx, const char *opt, const char *arg);
-
 int opt_max_alloc(void *optctx, const char *opt, const char *arg);
 
 int opt_cpuflags(void *optctx, const char *opt, const char *arg);

cmdutils_common_opts.h

@@ -19,6 +19,5 @@
     { "debug"      , HAS_ARG,  {.func_arg = opt_codec_debug},   "set debug flags", "flags" },
     { "fdebug"     , HAS_ARG,  {.func_arg = opt_codec_debug},   "set debug flags", "flags" },
     { "report"     , 0,        {(void*)opt_report}, "generate a report" },
-    { "report_file", HAS_ARG,  {.func_arg = opt_report_file},   "filename for storing the report" },
     { "max_alloc"  , HAS_ARG,  {.func_arg = opt_max_alloc},     "set maximum size of a single allocated block", "bytes" },
     { "cpuflags"   , HAS_ARG | OPT_EXPERT, {.func_arg = opt_cpuflags}, "force specific cpu flags", "flags" },