Add sal_textenc dependency to cppumaker

In Japanese localized Windows, cppumaker requires sal_textenclo.dll
but that rule isn't written in .mk. It causes build failure.

Change-Id: Icab74493a4a3b445144bb9d969b79636dbd17162
Reviewed-on: https://gerrit.libreoffice.org/7134
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>