[Rev 01] RFR: 8237770: Error creating fragment phong shader on iOS

[Jose Pereda]

> This PR defines a pre-processor in the phong frag files to avoid inline declaration of #extension when several frags are combined that leads to the error:
> 
> syntax error: #extension must always be before any non-preprocessor tokens

The pull request has been updated with 1 additional commit.

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Added commits:
 - 81338e6c: Apply #define right after #ifndef

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/93/files
  - new: https://git.openjdk.java.net/jfx/pull/93/files/14ccbe6a..81338e6c

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/93/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/93/webrev.00-01

  Stats: 30 lines in 15 files changed: 15 ins; 15 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/93.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/93/head:pull/93

PR: https://git.openjdk.java.net/jfx/pull/93