docker_build_wrap: remove activate_ccache

docker_build_wrap.sh

@@ -7,28 +7,6 @@
 #   BUILD_DEPENDS  (may be used by config.sh, can be empty)
 set -e
 
-function activate_ccache {
-    # Link up the correct location for ccache
-    ln -s /parent-home/.ccache $HOME/.ccache
-
-    # Now install ccache
-    yum install -y ccache
-
-    # Create fake compilers and prepend them to the PATH
-    # Note that yum is supposed to create these for us,
-    # but I had trouble finding them
-    local ccache_dir=/usr/lib/ccache/compilers
-    mkdir -p $ccache_dir
-    ln -s /usr/bin/ccache $CCACHE_DIR/gcc
-    ln -s /usr/bin/ccache $CCACHE_DIR/g++
-    ln -s /usr/bin/ccache $CCACHE_DIR/cc
-    ln -s /usr/bin/ccache $CCACHE_DIR/c++
-    export PATH=$CCACHE_DIR:$PATH
-
-    # Prove to the developer that ccache is activated
-    which gcc
-}
-
 if [ $USE_CCACHE == 1 ]; then
     activate_ccache
 fi