RFR: 8367374: JavaFX debug builds fail on Windows

[Jay Bhaskar]

Issue:  data_as_asm tool fails to generate cpp object from ICU symbols file when webkit builds in debug mode.
Solution: The ICU third party lib already using MSVC to build , Make ICU build in Release mode.

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

Commit messages:
 - 8367374: JavaFX debug builds fail on Windows

Changes: https://git.openjdk.org/jfx/pull/1901/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1901&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367374
  Stats: 9 lines in 1 file changed: 2 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jfx/pull/1901.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1901/head:pull/1901

PR: https://git.openjdk.org/jfx/pull/1901