icecc.bbclass: delete 'rm' command

The removed command was explicitly marked as transitional in commit [1] roughly
three years ago, so finally clean up.

[1] 40d74cb1d0dd ("icecc: Export ICECC_CC and friends via wrapper-script")

(From OE-Core rev: 4459e970c7c1c43f4061b1cb6229d7a3643e1bbc)

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/icecc.bbclass

@@ -380,7 +380,6 @@ set_icecc_env() {
     fi
     for compiler in $compilers; do
         ln -sf $ICECC_BIN $ICE_PATH/symlinks/$compiler
-        rm -f $ICE_PATH/$compiler
         cat <<-__EOF__ > $ICE_PATH/$compiler
 		#!/bin/sh -e
 		export ICECC_VERSION=$ICECC_VERSION