cross-compiling on windows needs openssl to build internal python

→ add back OPENSSL as a permissable sub-build target and explicitly
enable openssl when cross-compiling for windows_aarch64

partially reverts 4132bd5477c25a505f7bfbee1e7dcf6602c927d3

Change-Id: Ic162a2f0c6db377eadedb149fb428f0f015539f9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/148688
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
diff --git a/configure.ac b/configure.ac
index d8ec466..17fa8af 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5689,6 +5689,9 @@ if test "$cross_compiling" = "yes"; then
            sub_conf_opts="$sub_conf_opts --with-main-module=writer"
        fi
    fi
    # windows uses full-internal python and that in turn relies on openssl, so also enable openssl
    # when cross-compiling for aarch64, overriding the defaults below
    test "${PLATFORMID}" = "windows_aarch64" && sub_conf_opts="$sub_conf_opts --enable-openssl --with-tls=openssl"

    # Don't bother having configure look for stuff not needed for the build platform anyway
    # WARNING: any option with an argument containing spaces must be handled separately (see --with-theme)
@@ -5772,6 +5775,7 @@ if test "$cross_compiling" = "yes"; then
        LIBXSLT
        MDDS
        NATIVE
        OPENSSL
        ORCUS
        PYTHON
        SCRIPTING