config: add an option not to remove the destination directory

In certain circumstances, removing the destination/installation directory
is a bad idea. For example, when the build environment is already taking
care of sanitising the build tree, and pre-installs stuff in there, it is
a very bad idea to remove the destination directory.

This happens now in buildroot, as the crostool-NG backend now installs the
toolchain in the common host-tools directory, and pre-install there a few
host-utilities (eg. host-automake and host-gawk).

Provide a config knob to turn on/off the removal of the destination
directory, defaulting to 'y' (previous behavior), and forced to 'n' when
used as a backend.

Reported-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

# Build script for libtool

CT_LIBTOOL_VERSION=2.2.6b

do_companion_tools_libtool_get() {

    CT_GetFile "libtool-${CT_LIBTOOL_VERSION}" \

               {ftp,http}://ftp.gnu.org/gnu/libtool

}

do_companion_tools_libtool_extract() {

    CT_Extract "libtool-${CT_LIBTOOL_VERSION}"

    CT_Patch "libtool" "${CT_LIBTOOL_VERSION}"

}

do_companion_tools_libtool_build() {

    CT_DoStep EXTRA "Installing libtool"

    mkdir -p "${CT_BUILD_DIR}/build-libtool"

    CT_Pushd "${CT_BUILD_DIR}/build-libtool"

    CT_DoExecLog CFG \

    "${CT_SRC_DIR}/libtool-${CT_LIBTOOL_VERSION}/configure" \

        --prefix="${CT_TOOLS_OVERIDE_DIR}"

    CT_DoExecLog ALL make

    CT_DoExecLog ALL make install

    CT_Popd

    CT_EndStep

}