rng-tools: update to 6.15

Upstream bump

    Build system: x86_64
    Build-tested: bcm2711/RPi4B

Signed-off-by: John Audia <graysky@archlinux.us>

utils/rng-tools/Makefile

@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rng-tools
-PKG_VERSION:=6.10
-PKG_RELEASE:=3
+PKG_VERSION:=6.15
+PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/nhorman/rng-tools
 PKG_SOURCE_VERSION:=v$(PKG_VERSION)
-PKG_MIRROR_HASH:=853341a3be05164616ba11a8cf983847477e02d6d43a259fc2352dbec262d649
+PKG_MIRROR_HASH:=745a465062065104e2222ffc1b1bb3e0ce14626d44ee2176cb2a5c3723e3163a
 
 PKG_MAINTAINER:=Nathaniel Wesley Filardo <nwfilardo@gmail.com>
 PKG_LICENSE:=GPL-2.0-or-later