Avoid problem with "noinst_HEADERS" being sucked into "mysqld_LDADD" if...

Avoid problem with "noinst_HEADERS" being sucked into "mysqld_LDADD" if openssl_libs and yassl_libs are empty strings

sql/Makefile.am

@@ -43,7 +43,8 @@ mysqld_LDADD =		@MYSQLD_EXTRA_LDFLAGS@ \
                         @innodb_system_libs@ \
 			@ndbcluster_libs@ @ndbcluster_system_libs@ \
 			$(LDADD)  $(CXXLDFLAGS) $(WRAPLIBS) @LIBDL@ \
-                        @yassl_libs@ @openssl_libs@
+                        $(yassl_libs) $(openssl_libs)
+
 noinst_HEADERS =	item.h item_func.h item_sum.h item_cmpfunc.h \
 			item_strfunc.h item_timefunc.h item_uniq.h \
 			item_create.h item_subselect.h item_row.h \