Revert "Fix link errors in tools/nss and tests"

This reverts commit b3d9b08e.

Jansson cannot parse QEMU's quirky JSON.
Revert back to yajl.

https://bugzilla.redhat.com/show_bug.cgi?id=1614569Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

tools/Makefile.am

@@ -527,8 +527,7 @@ nss_libnss_libvirt_impl_la_CFLAGS = \
 
 nss_libnss_libvirt_impl_la_LIBADD = \
 	../gnulib/lib/libgnu.la \
-	../src/libvirt-nss.la \
-	$(DLOPEN_LIBS)
+	../src/libvirt-nss.la
 
 nss_libnss_libvirt_la_SOURCES =
 nss_libnss_libvirt_la_LDFLAGS = \
@@ -555,8 +554,7 @@ nss_libnss_libvirt_guest_impl_la_CFLAGS = \
 
 nss_libnss_libvirt_guest_impl_la_LIBADD = \
 	../gnulib/lib/libgnu.la \
-	../src/libvirt-nss.la \
-	$(DLOPEN_LIBS)
+	../src/libvirt-nss.la
 
 nss_libnss_libvirt_guest_la_SOURCES =
 nss_libnss_libvirt_guest_la_LDFLAGS = \