[jfx11u] RFR: 8270867: Debug build of WebKit 613.1 fails on Linux

[Ambarish Rapte]

Reviewed-by: kcr, jbhaskar

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Commit messages:
 - 8270867: Debug build of WebKit 613.1 fails on Linux

Changes: https://git.openjdk.java.net/jfx11u/pull/91/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=91&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270867
  Stats: 142 lines in 2 files changed: 1 ins; 141 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/91.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/91/head:pull/91

PR: https://git.openjdk.java.net/jfx11u/pull/91