RFR: 8244402: Lanai - Motif L&F - Non selected Radio button is barely rendered on non-retina display

[Denis Konoplev]

Implemented DrawPixel

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Commit messages:
 - DrawPixel implementation

Changes: https://git.openjdk.java.net/lanai/pull/67/files
 Webrev: https://webrevs.openjdk.java.net/lanai/67/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244402
  Stats: 26 lines in 3 files changed: 24 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/lanai/pull/67.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/67/head:pull/67

PR: https://git.openjdk.java.net/lanai/pull/67