Trash the horrible brp-sparc64-linux hack from the ancient past

- kludgery like this might've been necessary back in 2000 to get started
  with multilib setup but it certainly isn't needed now

installplatform

@@ -59,8 +59,8 @@ for SUBST in $SUBSTS ; do
  sparcv8-linux) MULTILIBNO=1 ;;
  sparcv9-linux) MULTILIBNO=1 ;;
  sparcv9v-linux) MULTILIBNO=1 ;;
- sparc64-linux) ARCH_INSTALL_POST=${pkglibdir}/brp-sparc64-linux; LIB=lib64; MULTILIBNO=2 ;;
- sparc64v-linux) ARCH_INSTALL_PORT=${pkglibdir}/brp-sparc64-linux; LIB=lib64; MULTILIBNO=2 ;;
+ sparc64-linux) LIB=lib64; MULTILIBNO=2 ;;
+ sparc64v-linux) LIB=lib64; MULTILIBNO=2 ;;
  s390-linux) MULTILIBNO=1 ;;
  s390x-linux) LIB=lib64; MULTILIBNO=2 ;;
  ppc-linux) MULTILIBNO=1 ;;

scripts/Makefile.am

@@ -24,7 +24,7 @@ EXTRA_DIST = \
 rpmconfig_SCRIPTS = \
  brp-compress brp-python-bytecompile brp-java-gcjcompile \
  brp-strip brp-strip-comment-note \
- brp-strip-shared brp-strip-static-archive brp-sparc64-linux \
+ brp-strip-shared brp-strip-static-archive \
  check-files check-prereqs \
  check-buildroot check-rpaths check-rpaths-worker \
  find-lang.sh \