RFR: 8258407: Split up CompileJavaModules.gmk into make/modules/$M/Java.gmk [v2]

[Magnus Ihse Bursie]

> Right now `CompileJavaModules.gmk` contains two different part: one part with the functionality needed to compile a java module, and one part were all special requirements for all modules are listed.
> 
> The second part should be removed from `CompileJavaModules.gmk`, and instead listed directly for each individual module in `make/modules/$M/Java.gmk`.
> 
> I used a special-written shell script to automatically extract the module-specific part from CompileJavaModules.gmk into the respective Java.gmk files, to avoid risking any hard-to-detect copy/paste errors. After this I did a `sed -i` to remove the module-specific prefix. All this makes me confident that I have correctly moved the variables (I realize this is hard to verify from the patch).

Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:

  Rename DISABLED_WARNINGS to DISABLED_WARNINGS_java to avoid overwriting the global variable

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1779/files
  - new: https://git.openjdk.java.net/jdk/pull/1779/files/09b5bee7..1e1cb858

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1779&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1779&range=00-01

  Stats: 6 lines in 6 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1779.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1779/head:pull/1779

PR: https://git.openjdk.java.net/jdk/pull/1779