Update lua-aho-corasick build rules

This continues work done in !547 by respecting sensible build patterns
across a submodule.

diff --git a/modules/policy/lua-aho-corasick b/modules/policy/lua-aho-corasick
index 47df012b383a0e79b9f40c1839b1581b00ce2989..5beaa28f4ef5ec20aa0adb75b54fabae556ec96d 160000 (submodule)
--- a/modules/policy/lua-aho-corasick
+++ b/modules/policy/lua-aho-corasick
@@ -1 +1 @@
-Subproject commit 47df012b383a0e79b9f40c1839b1581b00ce2989
+Subproject commit 5beaa28f4ef5ec20aa0adb75b54fabae556ec96d