+gnutls+p11-kit+libtasn1+libunistring+nettle

[jhheider]

(gnutls requires too many things; skipped guile because it looks awful; does anyone use guile?)

ref #99

[what-the-diff]

• Added a new package: p11-kit
• Updated the version of libtasn1 to 4.19.0 and added assign files for testing purposes
• Added a new package: libunistring, which is used by gnutls as dependency
• Updated nettle's version from 3.* to 3.[6]* (latest stable) and updated its dependencies accordingly
• Changed gnu/gnutls' versions format from x[y].z to x.[y]z in order not have conflicts with other packages that use this same naming convention but are different projects (ej.: GNU C Library). Also changed the URL where it downloads its source code since ftp://ftp... was deprecated on favor of https://www..gnuorg/. Finally, removed unboundnet as dependency because it wasn't being used anymore after updating nettle's version; also added freedesktoporg/pkgconfig as build depedency so we can run tests properly later on when building gnutls itself instead of just running them against one or two binaries like addr2line or objdump respectively

[jhheider]

wow, I can't believe that worked.