dev-java/icedtea-web: EAPI 8, restrict build VM to 1.8

- java-pkg-2.eclass is inherited to set up JDK 8 as the build VM
  properly, so a JAVA_HOME that points to JDK 8 is always passed to the
  ./configure script regardless of the eselect-java system VM setting.

- The 'itw-modularjdk.args' file is now installed to an FHS-compliant
  path to allow the programs from this package to be run with JRE 9+.
  These programs are compatible with JRE 9+ under the condition that
  this file is installed.  The file is required for integration with the
  Java Platform Module System introduced in Java 9.

- README.gentoo is updated to convey the USE="-headless-awt" requirement
  for any JRE used to run those programs.  This seems to be a
  runtime-only requirement, as using a JDK with this USE flag disabled
  would not cause any build errors during testing.

Bug: https://bugs.gentoo.org/659174
Bug: https://bugs.gentoo.org/698582
Bug: https://bugs.gentoo.org/783027
Bug: https://bugs.gentoo.org/831895
Signed-off-by: Yuan Liao <liaoyuan@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/24610
Signed-off-by: Florian Schmaus <flow@gentoo.org>

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