multimedia/mpv: unbreak fetch due to repo growth

$ make checksum TRYBROKEN= MASTER_SITE_BACKUP= DISTDIR=$(mktemp -dt distfiles)
[...]
=> 1bb2665e3d09.patch doesn't seem to exist in /tmp/distfiles.iVgzzfBs/.
=> Attempting to fetch https://github.com/mpv-player/mpv/commit/1bb2665e3d09.patch
fetch: https://github.com/mpv-player/mpv/commit/1bb2665e3d09.patch: size mismatch: expected 2337, actual 2341
=> Couldn't fetch it - please try to retrieve this
=> port manually into /tmp/distfiles.iVgzzfBs/ and try again.
*** Error code 1

-index 833fbddb1b..4a1ffd4579 100644
+index 833fbddb1bd..4a1ffd45798 100644
-index 8318c5190c..a1fb04bd59 100644
+index 8318c5190c5..a1fb04bd592 100644
-index 4a1ffd4579..2802ce914c 100644
+index 4a1ffd45798..2802ce914ca 100644
-index a1fb04bd59..dff20f716d 100644
+index a1fb04bd592..dff20f716d6 100644
-index 2802ce914c..265787e73a 100644
+index 2802ce914ca..265787e73a9 100644
-index dff20f716d..df0c05e139 100644
+index dff20f716d6..df0c05e139e 100644
-index df0c05e139..3365daa48a 100644
+index df0c05e139e..3365daa48a5 100644
-index 3365daa48a..46c289dafe 100644
+index 3365daa48a5..46c289dafe3 100644
-index 46c289dafe..f4ba8db7c7 100644
+index 46c289dafe3..f4ba8db7c7c 100644
-index d70286647f..1c0b9e146b 100644
+index d70286647fc..1c0b9e146be 100644
-index 52a38b63be..7c347cb138 100644
+index 52a38b63be2..7c347cb1380 100644
-index 0000000000..11b182e52d
+index 00000000000..11b182e52d9
-index 0ced76244a..e9f4d53002 100644
+index 0ced76244a0..e9f4d53002c 100644
-index 14c254e1ec..a12cbf19e1 100644
+index 14c254e1ec9..a12cbf19e17 100644
-index 706c952604..5545b3378d 100644
+index 706c9526046..5545b3378d5 100644
-index f8df590511..8244acff26 100644
+index f8df590511d..8244acff261 100644

PR:		257239
Reported by:	Oleh Vinichenko