RFR: 8341920: Intermittent WebKit build failure on Windows generating PDB files in 619.1

[Hima Bindu Meda]

Disabled the pdb file generation in order to resolve the build failure.
Sanity testing looks fine. Verified build on windows, mac and linux.

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Commit messages:
 - remove condition
 - Disable pdb files

Changes: https://git.openjdk.org/jfx/pull/1599/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1599&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341920
  Stats: 9 lines in 1 file changed: 7 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1599.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1599/head:pull/1599

PR: https://git.openjdk.org/jfx/pull/1599