Add support for libjavascriptcoregtk-6.0.

[nmoinvaz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 136 lines in your changes missing coverage. Please review.

Project coverage is 59.14%. Comparing base (6444b36) to head (0a22a43).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
execute_jsc.c	53.73%	57 Missing and 36 partials ⚠️
execute_jscore.c	39.70%	21 Missing and 20 partials ⚠️
execute.c	33.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   59.42%   59.14%   -0.28%     
==========================================
  Files          53       54       +1     
  Lines        4725     4891     +166     
  Branches     1082     1114      +32     
==========================================
+ Hits         2808     2893      +85     
- Misses       1317     1368      +51     
- Partials      600      630      +30     

Flag	Coverage Δ
macos	55.75% <39.13%> (+0.14%)	⬆️
ubuntu	55.21% <53.69%> (+0.89%)	⬆️
ubuntu_curl	56.92% <53.20%> (+0.65%)	⬆️
windows	56.84% <ø> (ø)

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[nmoinvaz]

Not sure if I should try to dynamically load g_object_ref in code.

[nmoinvaz]

I also wonder if I should do a check for webkit libraries being loaded and only allow it to load the version associated with the version of webkit that is loaded, but it seems like overkill.