RFR: 8320965: Scrolling on a touch enabled display fails on Wayland [v4]

[Jose Pereda]

> This PR replaces the deprecated `gdk_pointer_grab` with `gdk_seat_grab`, and `gdk_pointer_ungrab ` with `gdk_seat_ungrab`, using runtime checks and wrapped functions for GTK 3.20+ (so systems without it still run with GTK 3.8+), and fixes the dragging issue on Wayland.

Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:

  Revert changes and add touch mask to gdk pointer grab function

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1305/files
  - new: https://git.openjdk.org/jfx/pull/1305/files/f8ffe87f..ca5766fd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1305&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1305&range=02-03

  Stats: 105 lines in 5 files changed: 1 ins; 93 del; 11 mod
  Patch: https://git.openjdk.org/jfx/pull/1305.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1305/head:pull/1305

PR: https://git.openjdk.org/jfx/pull/1305