include: remove file before overwritting it with replace_script

config.{sub,guess} could be symlinks to a shared common version of
this file (e.g. in staging). So we remove the destination file via
--remove-destination option of cp. This prevents replaceing the
common file that other packages could be build with if running at
the same time.

This fixes a class of errors where config.sub is missing, or
only partially present when running configure because a cp is
currently in progress

This is commonly seen building with a lot of parallel jobs and
on packages that use 'PKG_FIXUP:=autoreconf'

Signed-off-by: Matthew McClintock <mmcclint@qca.qualcomm.com>
Signed-off-by: Mathieu Olivari <mathieu@qca.qualcomm.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42547 3c298f89-4303-0410-b956-a3cf2f4a3e73

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