Remove powerpc from release architectures

https://lists.debian.org/debian-devel-announce/2016/10/msg00008.html

Signed-off-by: Jonathan Wiltshire <jmw@debian.org>

britney.conf

@@ -25,7 +25,7 @@ STATIC_INPUT_DIR = /srv/release.debian.org/britney/input
 STATE_DIR          = /srv/release.debian.org/britney/state
 
 # List of release architectures
-ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el powerpc ppc64el s390x
+ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
 
 # if you're not in this list, arch: all packages are allowed to break on you
 NOBREAKALL_ARCHES = i386 amd64

britney_nobreakall.conf

@@ -25,10 +25,10 @@ STATIC_INPUT_DIR = /srv/release.debian.org/britney/input
 STATE_DIR          = /srv/release.debian.org/britney/state
 
 # List of release architectures
-ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el powerpc ppc64el s390x
+ARCHITECTURES     = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
 
 # if you're not in this list, arch: all packages are allowed to break on you
-NOBREAKALL_ARCHES = i386 amd64 arm64 armel armhf mips mipsel mips64el powerpc ppc64el s390x
+NOBREAKALL_ARCHES = i386 amd64 arm64 armel armhf mips mipsel mips64el ppc64el s390x
 
 # if you're in this list, your packages may not stay in sync with the source
 OUTOFSYNC_ARCHES  =