makechrootpkg: fixed copying of .install files to chroot for split packages

done

install_files=$(grep "install=" PKGBUILD)

for pkg in ${pkgname[@]}; do

    install_files+=' '

    install_files+=$(echo $install_files |sed "s/\$pkgname/$pkg/"|sed "s/\${pkgname}/$pkg/")

done

install_files=$(eval echo $install_files |tr '[:blank:]' '\n'|sort |uniq)

for f in $install_files;do

    install="${f#"install="}"

    if [ "$install" != "" -a -f "$install" ]; then