add @rx macro expansion test to list in Makefile

Author: asterite3

Makefile.am

@@ -128,6 +128,7 @@ TESTS+=test/test-cases/regression/variable-TIME_MIN.json
 TESTS+=test/test-cases/regression/action-setuid.json
 TESTS+=test/test-cases/regression/action-setrsc.json
 TESTS+=test/test-cases/regression/issue-1152.json
+TESTS+=test/test-cases/regression/issue-1528.json
 TESTS+=test/test-cases/regression/config-calling_phases_by_name.json
 TESTS+=test/test-cases/regression/variable-USERID.json
 TESTS+=test/test-cases/regression/request-body-parser-multipart.json