[jdk11u-dev] RFR: 8284956: Potential leak awtImageData/color_data when initializes X11GraphicsEnvironment

[Zhengyu Gu]

A clean backport to fix memory leaks.

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Commit messages:
 - Backport cbe7e7bd7f7e7ea9f7221ef206917c58baff7696

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1132/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1132&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284956
  Stats: 42 lines in 1 file changed: 31 ins; 4 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1132.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1132/head:pull/1132

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1132