Merge bitcoin#19536: qt, build: Fix QFileDialog for static builds

6457361 qt: Fix QFileDialog for static builds (Hennadii Stepanov)

Pull request description:

  This change partially reverts 248e22b (bitcoin#16386) and makes `QFileDialog`s work again for static builds.

  Fixes bitcoin-core/gui#32.

ACKs for top commit:
  fanquake:
    ACK 6457361. Although it would be good to know exactly _why_ this fixes the issue. At this stage I also don't think this should be a blocker for 0.20.1.
  theuni:
    ACK 6457361

Tree-SHA512: 8ad27e0bcae6debd02f73b7c374743e37d4edd806922b103a2fe494cf2d9930fe9ef3107b5a6c61f3c466cf7462de2641171880398954e7f2c4f417f5bb820d7

depends/packages/qt.mk

@@ -86,7 +86,6 @@ $(package)_config_opts += -no-feature-colordialog
 $(package)_config_opts += -no-feature-commandlineparser
 $(package)_config_opts += -no-feature-concurrent
 $(package)_config_opts += -no-feature-dial
-$(package)_config_opts += -no-feature-filesystemwatcher
 $(package)_config_opts += -no-feature-fontcombobox
 $(package)_config_opts += -no-feature-ftp
 $(package)_config_opts += -no-feature-image_heuristic_mask