bbappend for php extension recipe

EXTRA_OECONF += "--enable-elphel"

DEV_DIR ?= "${TOPDIR}/../../rootfs-elphel/elphel-apps-php-extension/ext"

do_unpack_append(){

    print("Link extension to the main tree")

    if os.path.isdir("${DEV_DIR}"):

        print("DEV_DIR exists - creating links...")

        devdir_abspath = os.path.abspath("${DEV_DIR}")

        for path, folders, files in os.walk("${DEV_DIR}"):

            folders[:]=[fd for fd in folders if fd != ".git"]

            for folder in folders:

                folder_abspath = os.path.abspath(os.path.join(path, folder))

                folder_relpath = folder_abspath.replace(devdir_abspath+"/", '')

                os.system("cd ${S}/ext;mkdir -p "+folder_relpath)

            for filename in files:

                file_abspath = os.path.abspath(os.path.join(path, filename))

                file_relpath = file_abspath.replace(devdir_abspath+"/", '')

                os.system("cd ${S}/ext;ln -sf "+file_abspath+" "+file_relpath)

}

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