libarchive: prevent linking against opt/nettle

libarchive/Pkgfile

@@ -5,7 +5,7 @@
 
 name=libarchive
 version=3.0.4
-release=1
+release=2
 source=(http://www.libarchive.org/downloads/$name-$version.tar.gz)
 
 build() {
@@ -19,7 +19,10 @@ build() {
 	# needed for the xar format which we can live without.
 	./configure --prefix=/usr --mandir=/usr/man \
 	            --without-lzmadec \
-	            --without-xml2 --without-expat --without-openssl
+	            --without-xml2 \
+                    --without-expat \
+                    --without-nettle \
+                    --without-openssl
 
 	make
 	make DESTDIR=$PKG install