eglibc: fix re-execution of task

eglibc: fix re-execution of task

Task do_patch_append calling do_fix_ia_headers is removing files using "rm" not "rm -f".
So first time execution of patch task is success, while re-execution of patch task
fails as it tries to remove the files already removed.

So changed "rm" to "rm -f".

[Yocto #2194]

Signed-off-by: Venkata Ramana Gollamudi <ramana.gollamudi@huawei.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>