fix HOMEPAGE on security/libfprint

there is a "a" in HOMEPAGE, and use https now

Index: Makefile
===================================================================
RCS file: /data/cvs/ports/security/libfprint/Makefile,v
retrieving revision 1.29
diff -u -p -r1.29 Makefile
--- Makefile 26 Apr 2018 16:01:45 -0000 1.29
+++ Makefile 31 Oct 2018 08:45:47 -0000
@@ -8,7 +8,7 @@ CATEGORIES= security

SHARED_LIBS += fprint 1.1 # 0.0

-HOMEPAGE=a http://www.freedesktop.org/wiki/Software/fprint/libfprint
+HOMEPAGE= https://www.freedesktop.org/wiki/Software/fprint/libfprint
MASTER_SITES= http://people.freedesktop.org/~hadess/
EXTRACT_SUFX= .tar.xz