libraries/libpgf: Fix download URL.

Signed-off-by: B. Watson <yalhcru@gmail.com>

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

libraries/libpgf/libpgf.info

@@ -1,7 +1,7 @@
 PRGNAM="libpgf"
 VERSION="7.21.7"
 HOMEPAGE="http://www.libpgf.org"
-DOWNLOAD="https://netactuate.dl.sourceforge.net/project/libpgf/libpgf/7.21.7/libpgf.zip"
+DOWNLOAD="https://downloads.sourceforge.net/project/libpgf/libpgf/7.21.7/libpgf.zip"
 MD5SUM="6e956fc3575a9047bafc2782ec17041f"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""