gnu: Use HTTPS for all sourceforge.net home pages.

gnu: Use HTTPS for all sourceforge.net home pages.

* gnu/packages/admin.scm (mingetty, clusterssh)[home-page]: Use HTTPS.
* gnu/packages/audio.scm (libbs2b, soxr)[home-page]: Likewise.
* gnu/packages/bioinformatics.scm (bless)[home-page]: Likewise.
* gnu/packages/display-managers.scm (slim)[home-page]: Likewise.
* gnu/packages/games.scm (extremetuxracer)[home-page]: Likewise.
* gnu/packages/ghostscript.scm (gs-fonts)[home-page]: Likewise.
* gnu/packages/haskell.scm (ghc-regex-base, ghc-regex-posix,
ghc-regex-compat)[home-page]: Likewise.
* gnu/packages/image.scm (imlib2)[home-page]: Likewise.
* gnu/packages/libreoffice.scm (librevenge, libcmis, libodfgen, libmwaw)
[home-page]: Likewise.
* gnu/packages/linux.scm (hdparm, acpid, libavc1394, rng-tools)
[home-page]: Likewise.
* gnu/packages/mail.scm (esmtp)[home-page]: Likewise.
* gnu/packages/mp3.scm (ripperx)[home-page]: Likewise.
* gnu/packages/onc-rpc.scm (libtirpc)[home-page]: Likewise.
* gnu/packages/perl.scm (perl-czplib)[home-page]: Likewise.
* gnu/packages/python.scm (python-pyasn1-modules)[home-page]: Likewise.
* gnu/packages/xdisorg.scm (xosd)[home-page]: Likewise.