package/cutelyst: bump to version 2.7.0

package/cutelyst: bump to version 2.7.0

Commit c110e48cecde6f543da18388322907b05b25e7d2 disabled openssl support
on QT 5.6, this has the side-effect of breaking the build of cutelyst
because cutelyst does not manage build with QT_NO_SSL, see:
https://github.com/cutelyst/cutelyst/issues/159

This bump fixes the issue by bumping cutelyst to version 2.7.0 and by
removing the uneeded select on BR2_PACKAGE_OPENSSL

Fixes:
 - http://autobuild.buildroot.org/results/4299221429713ace25fc234abeb81697bc410647

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>