RFR: JDK-8142336: Convert the SA agent build to modular build-infra makefiles

[Erik Joelsson]

Closed part of this review.

Bug: Bug: https://bugs.openjdk.java.net/browse/JDK-8142336
Webrev with both open and closed changes:
http://javaweb.us.oracle.com/~ejoelsso/webrev/8142336/webrev.closed.01/

/Erik