Allow multi-word "install" command.

Autoconf can determine that the correct install command includes flags,
e.g., "/usr/bin/install -c". When using this as a command, we can't
enclose the value in double-quotes, as that makes some shells use the
whole expression as a filename:

# this is the value returned by autoconf and stored in CT_install
$ ins="/usr/bin/install -c"

# if we call it with quotes, the command is not found
$ "${ins}"
bash: /usr/bin/install -c: No such file or directory

# removing the quotes lets it work as expected
$ ${ins}
/usr/bin/install: missing file operand
Try `/usr/bin/install --help' for more information.

Signed-Off-By: Anthony Foiani <anthony.foiani@gmail.com>

# Build script for m4

CT_M4_VERSION=1.4.13

do_companion_tools_m4_get() {

    CT_GetFile "m4-${CT_M4_VERSION}" \

               {ftp,http}://ftp.gnu.org/gnu/m4

}

do_companion_tools_m4_extract() {

    CT_Extract "m4-${CT_M4_VERSION}"

    CT_Patch "m4" "${CT_M4_VERSION}"

}

do_companion_tools_m4_build() {

    CT_DoStep EXTRA "Installing m4"

    mkdir -p "${CT_BUILD_DIR}/build-m4"

    CT_Pushd "${CT_BUILD_DIR}/build-m4"

    CT_DoExecLog CFG \

    "${CT_SRC_DIR}/m4-${CT_M4_VERSION}/configure" \

        --prefix="${CT_BUILDTOOLS_PREFIX_DIR}"

    CT_DoExecLog ALL make

    CT_DoExecLog ALL make install

    CT_Popd

    CT_EndStep

}