Disable uv_backend_fd integration

[vtjnash]

Might fix #503
Closes JuliaLang/julia#35552

[codecov]

Codecov Report

Merging #630 (a81d57e) into master (d76faaa) will decrease coverage by 1.17%.
The diff coverage is n/a.

❗ Current head a81d57e differs from pull request most recent head 28066d6. Consider uploading reports for the commit 28066d6 to get more accurate results

@@            Coverage Diff             @@
##           master     #630      +/-   ##
==========================================
- Coverage   65.69%   64.52%   -1.18%     
==========================================
  Files          32       32              
  Lines        2720     2227     -493     
==========================================
- Hits         1787     1437     -350     
+ Misses        933      790     -143     

Impacted Files	Coverage Δ
src/GLib/signals.jl	74.64% <ø> (-1.18%)	⬇️
src/GLib/glist.jl	77.93% <0.00%> (-6.99%)	⬇️
src/layout.jl	71.42% <0.00%> (-6.00%)	⬇️
src/GLib/MutableTypes.jl	59.09% <0.00%> (-4.91%)	⬇️
src/gdk.jl	50.00% <0.00%> (-4.84%)	⬇️
src/selectors.jl	20.65% <0.00%> (-4.58%)	⬇️
src/GLib/GLib.jl	73.68% <0.00%> (-2.51%)	⬇️
src/toolbar.jl	87.50% <0.00%> (-2.50%)	⬇️
src/container.jl	64.28% <0.00%> (-2.39%)	⬇️
src/buttons.jl	64.78% <0.00%> (-2.28%)	⬇️
... and 20 more

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[jwahlstrand]

I can confirm that this works on Mac, Linux, and Windows. I see some sporadic lag in the REPL but it's not really reproducible or particularly bothersome. Thanks for fixing this.