RFR: 8357625: Build should generate platform specific shaders [v3]

[Ambarish Rapte]

> On a given platform, the build generates prism and decora shader files for all platforms. 
> Ideally it should generate only the platform specific shader files.
> 
> Fix:
> Generate only platform specific hardware shaders.
> sw pipeline shaders must be generated for all platforms.
> 
> But the hardware shaders, should be as:
> 1. Mac platform : metal and es2 shaders
> 2. Win platform: d3d shaders and if IS_INCLUDE_ES2 is true then es2 shaders as well
> 3. Linux : only es2 shaders
> 
> Verification:
> Verified that the shaders are generated as expected. 
> headul tests pass, apps launch correctly.

Ambarish Rapte has updated the pull request incrementally with one additional commit since the last revision:

  avoid Decora and Prism dir, under javafx.graphics/build/hlsl

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/2071/files
  - new: https://git.openjdk.org/jfx/pull/2071/files/7cd12549..e34dd05f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=2071&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=2071&range=01-02

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/2071.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2071/head:pull/2071

PR: https://git.openjdk.org/jfx/pull/2071