[jdk11u-dev] RFR: 8213922: fix ctw stand-alone build

[Aleksey Shipilev]

This allows CTW bundle to be built again. Note that it is unclean backport, and it includes the part of "8214917: CTW testlibrary shouldn't ignore errors raised by the library itself" -- which is already quite messy, and would be inconvenient to work in through the regular process.

Additional testing: 
 - [x] Standalone CTW build with JDK 11 now works
 - [x] Sample standalone CTW run with JDK 11 works

-------------

Commit messages:
 - Transplant a part of 8214917: CTW testlibrary shouldn't ignore errors raised by the library itself
 - Backport e53852dd51f473587297c1631b2f07f594e43e0a

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/101/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=101&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8213922
  Stats: 33 lines in 1 file changed: 21 ins; 3 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/101.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/101/head:pull/101

PR: https://git.openjdk.java.net/jdk11u-dev/pull/101