pi-blaster: bump to revision befd8ef

Also:
 - remove upstreamed patch.
 - update LIC_FILES_CHKSUM: License in the README was moved a
   couple of lines below

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>

recipes-devtools/pi-blaster/files/0001-pi-blaster-Include-sys-sysmacros.h-for-makedev.patch

@@ -1,32 +0,0 @@
-From 6a6b705ff5cba960c54bdb4d4bcdaa3b00a854a2 Mon Sep 17 00:00:00 2001
-From: Khem Raj <raj.khem@gmail.com>
-Date: Sat, 11 Aug 2018 10:24:24 -0700
-Subject: [PATCH] pi-blaster: Include sys/sysmacros.h for makedev()
-
-In glibc 2.28+ this header is not included indirectly anymore
-
-fixes
-
-ld: pi-blaster.o: in function `mbox_open':
-pi-blaster.c:(.text+0x28): undefined reference to `makedev'
-collect2: error: ld returned 1 exit status
-
-Upstream-Status: Submitted [https://github.com/sarfata/pi-blaster/pull/100]
-
-Signed-off-by: Khem Raj <raj.khem@gmail.com>
----
- pi-blaster.c | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/pi-blaster.c b/pi-blaster.c
-index 6cfd010..fc4e686 100644
---- a/pi-blaster.c
-+++ b/pi-blaster.c
-@@ -41,6 +41,7 @@ static char VERSION[] = "SNAPSHOT";
- #include <sys/time.h>
- #include <sys/types.h>
- #include <sys/stat.h>
-+#include <sys/sysmacros.h>
- #include <fcntl.h>
- #include <sys/mman.h>
- #include "mailbox.h"