security/libtasn1: Restore symbol versions

Enable linker version script after 41d3d59d0c.  The configure test
fails with clang.

PR:		284651

security/libtasn1/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	libtasn1
 PORTVERSION=	4.20.0
+PORTREVISION=	1
 CATEGORIES=	security
 MASTER_SITES=	GNU \
 		GNUPG/gnutls/${PORTNAME}
@@ -16,7 +17,7 @@ USES=		cpe libtool pathfix pkgconfig
 USE_CSTD=	c99
 USE_LDCONFIG=	yes
 GNU_CONFIGURE=	yes
-GNU_CONFIGURE_MANPREFIX=${PREFIX}/share
+CONFIGURE_ARGS=	--enable-ld-version-script
 INSTALL_TARGET=	install-strip
 CPE_VENDOR=	gnu