development/guile2.2: Use https for DOWNLOAD

Some people use a web browser to download things (yeah, I know,
they should use curl or wget or something else, but...), and
modern web browsers apparently don't know how to handle ftp links
any more :/

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

development/guile2.2/guile2.2.info

@@ -1,7 +1,7 @@
 PRGNAM="guile2.2"
 VERSION="2.2.6"
 HOMEPAGE="https://www.gnu.org/software/guile"
-DOWNLOAD="ftp://ftp.gnu.org/gnu/guile/guile-2.2.6.tar.xz"
+DOWNLOAD="https://ftp.gnu.org/gnu/guile/guile-2.2.6.tar.xz"
 MD5SUM="e946a685e782685f6ebb97026131a315"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""