package/mcrypt: drop package

package/mcrypt: drop package

Drop mcrypt which is a cryptographic package that is not maintained
anymore. Here is an extract of https://en.wikipedia.org/wiki/Mcrypt:
"The last update to libmcrypt was in 2007, despite years of unmerged
patches. These facts have led security experts to declare mcrypt
abandonware and discourage its use in new development."

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>