RFR: 8255240: Mobile builds need to exclude some modules [v2]

[Johan Vos]

> exclude some modules that are not relevant on Mobile.
> Fix for JDK-8255240

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  Don't exclude java.desktop and jdk.accessibility modules.
  Don't build the native sound/window libs though.
  Add changes for generating char files and Xevent files (android)

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Changes:
  - all: https://git.openjdk.java.net/mobile/pull/10/files
  - new: https://git.openjdk.java.net/mobile/pull/10/files/6d5619be..83200b4f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=mobile&pr=10&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=mobile&pr=10&range=00-01

  Stats: 7 lines in 4 files changed: 2 ins; 2 del; 3 mod
  Patch: https://git.openjdk.java.net/mobile/pull/10.diff
  Fetch: git fetch https://git.openjdk.java.net/mobile pull/10/head:pull/10

PR: https://git.openjdk.java.net/mobile/pull/10