Adding FIXPATH_BASE in RunTestsPrebuilt.gmk as that's needed for the FixPath make macro to work.
------------- Commit messages: - Set FIXPATH_BASE in RunTestsPrebuilt.gmk Changes: https://git.openjdk.java.net/jdk/pull/2460/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2460&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8259656 Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jdk/pull/2460.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/2460/head:pull/2460 PR: https://git.openjdk.java.net/jdk/pull/2460
