RFR: Fix for CODETOOLS-7902719

[Kumar Srinivasan]

Hi Jon,

Please review fixes for [1] with Webrev at  [2].

Windows jtreg testing needs some serious TLC explained later.

Descriptions of changes:
1. make/Defs.gmk: on windows the absolute directory is incorrectly computed.
2. make/build-all.sh: its a fix again for windows I think the line termination is in play.
3. Tool.java self explanatory with this the AOT tests work fine now.
4. faq.md: added the new environment variables
5. tag-spec.html: the tidy on my Mac complained about tables not having “Summary” so I added these.

Please let me know if you have any comments.

Thanks
Kumar Srinivasan

[1] https://bugs.openjdk.java.net/browse/CODETOOLS-7902719
[2] http://cr.openjdk.java.net/~ksrini/CODETOOLS-7902719/webrev.00/


Windows Saga:
1.This needs Cygwin + Xwin + X11 support, there are tests that sets the DISPLAY for applet and UI tests.

2. I touched the following files to pass, the failures can be categorized into well known Windows issues, Cygwin absolute paths (/tmp vs c:/cygwin64/tmp), incorrect path separator(:), not taking into account line terminators (\n\r).
C:/cygwin64/tmp/jtreg-src/build/i18n.com.sun.javatest.regtest.tool.ok
C:/cygwin64/tmp/jtreg-src/build/i18n.com.sun.javatest.diff.ok
C:/cygwin64/tmp/jtreg-src/build/AgentOut.ok
C:/cygwin64/tmp/jtreg-src/build/autovm.ok
C:/cygwin64/tmp/jtreg-src/build/ReportOnlyTest.ok
C:/cygwin64/tmp/jtreg-src/build/BuildWildcards.ok
C:/cygwin64/tmp/jtreg-src/build/BuildPatternTest.ok
C:/cygwin64/tmp/jtreg-src/build/ClassDirsTest.ok
C:/cygwin64/tmp/jtreg-src/build/CompileArgFileTest.ok
C:/cygwin64/tmp/jtreg-src/build/ShowGroupTest.ok
C:/cygwin64/tmp/jtreg-src/build/TestJDKVersion.classes.ok
C:/cygwin64/tmp/jtreg-src/build/TestJDKVersion.jar.ok
C:/cygwin64/tmp/jtreg-src/build/TestNativePath.ok
C:/cygwin64/tmp/jtreg-src/build/TestNativePath.agentvm.ok
C:/cygwin64/tmp/jtreg-src/build/TestNativePath.othervm.ok
C:/cygwin64/tmp/jtreg-src/build/RequiresTest.ok
C:/cygwin64/tmp/jtreg-src/build/StatsTxt.1.ok
C:/cygwin64/tmp/jtreg-src/build/StatsTxt.2.ok
C:/cygwin64/tmp/jtreg-src/build/StatusFilter.ok