fftools/ffmpeg_opt: Fix [u]int64_t specifier string

PRId64 and PRIu64 already expand to the complete specifier; adding
another 'd' at the end is wrong and just leads to warnings that say
that only an option like '-frames:v 2d' will be used, although said
option won't be accepted at all ('Expected int64 for frames:v but found
2d').
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

fftools/ffmpeg_opt.c

@@ -46,8 +46,8 @@
 
 #define SPECIFIER_OPT_FMT_str  "%s"
 #define SPECIFIER_OPT_FMT_i    "%i"
-#define SPECIFIER_OPT_FMT_i64  "%"PRId64"d"
-#define SPECIFIER_OPT_FMT_ui64 "%"PRIu64"d"
+#define SPECIFIER_OPT_FMT_i64  "%"PRId64
+#define SPECIFIER_OPT_FMT_ui64 "%"PRIu64
 #define SPECIFIER_OPT_FMT_f    "%f"
 #define SPECIFIER_OPT_FMT_dbl  "%lf"