Bug 1563465 - Remove leftovers from bug 1451104. r=froydnj

Bug 1451104 removed the GCC 4.9 toolchain, but left the build script and
the patch that only that toolchain build was using.

Differential Revision: https://phabricator.services.mozilla.com/D36886

--HG--
extra : moz-landing-system : lando

build/unix/build-gcc/PR64905.patch

@@ -1,11 +0,0 @@
---- trunk/gcc/lra-eliminations.c	2015/02/04 20:00:48	220415
-+++ trunk/gcc/lra-eliminations.c	2015/02/04 20:02:21	220416
-@@ -182,6 +182,8 @@
-   if (! value
-       && ep->from == FRAME_POINTER_REGNUM && ep->to == STACK_POINTER_REGNUM)
-     frame_pointer_needed = 1;
-+  if (!frame_pointer_needed)
-+    REGNO_POINTER_ALIGN (HARD_FRAME_POINTER_REGNUM) = 0;
- }
- 
- /* Map: eliminable "from" register -> its current elimination,

taskcluster/scripts/misc/build-gcc-4.9-linux.sh

@@ -1,34 +0,0 @@
-#!/bin/bash
-set -e
-
-# This script is for building GCC 4.9 for Linux.
-
-WORKSPACE=$HOME/workspace
-HOME_DIR=$WORKSPACE/build
-UPLOAD_DIR=$HOME/artifacts
-
-root_dir=$HOME_DIR
-data_dir=$HOME_DIR/src/build/unix/build-gcc
-
-. $data_dir/build-gcc.sh
-
-gcc_version=4.9.4
-gcc_ext=bz2
-binutils_version=2.25.1
-binutils_ext=bz2
-
-pushd $root_dir/gcc-$gcc_version
-ln -sf ../cloog-0.18.1 cloog
-ln -sf ../gmp-5.1.3 gmp
-ln -sf ../mpc-0.8.2 mpc
-ln -sf ../isl-0.12.2 isl
-ln -sf ../mpfr-3.1.5 mpfr
-popd
-
-apply_patch $data_dir/PR64905.patch
-build_binutils
-build_gcc
-
-# Put a tarball in the artifacts dir
-mkdir -p $UPLOAD_DIR
-cp $HOME_DIR/gcc.tar.* $UPLOAD_DIR