ffmpeg: remove Blackfin related patch

And renumber remaining patches.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ffmpeg/0001-bfin-disable-optimization.patch

@@ -1,26 +0,0 @@
-Fix bfin compile error
-
-See gcc bug report:
-https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77311
-
-Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
-
-diff -Nur ffmpeg-2.8.7.orig/libavcodec/hevcdsp_template.c ffmpeg-2.8.7/libavcodec/hevcdsp_template.c
---- ffmpeg-2.8.7.orig/libavcodec/hevcdsp_template.c	2016-03-29 04:25:16.000000000 +0200
-+++ ffmpeg-2.8.7/libavcodec/hevcdsp_template.c	2016-08-12 21:32:36.728178969 +0200
-@@ -1517,7 +1517,14 @@
- #define TQ2 pix[2  * xstride + 3 * ystride]
- #define TQ3 pix[3  * xstride + 3 * ystride]
- 
--static void FUNC(hevc_loop_filter_luma)(uint8_t *_pix,
-+// Blackfin gcc 6.1.x fails with
-+// unable to find a register to spill in class CCREGS
-+#if defined(__bfin__)
-+#define disable_opt __attribute__ ((optimize("O1")))
-+#else
-+#define disable_opt 
-+#endif
-+static void disable_opt FUNC(hevc_loop_filter_luma)(uint8_t *_pix,
-                                         ptrdiff_t _xstride, ptrdiff_t _ystride,
-                                         int beta, int *_tc,
-                                         uint8_t *_no_p, uint8_t *_no_q)