Recursion fix to correctly reset RecursionDepth whenever a longjmp occurs

[ChrisJefferson]

This ensures we correctly reset RecursionDepth whenever a longjmp occurs.

[wilfwilson]

Thanks a lot for sorting this out Chris

[codecov]

Codecov Report

Merging #1753 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1753      +/-   ##
==========================================
+ Coverage   63.43%   63.44%   +<.01%     
==========================================
  Files        1000     1000              
  Lines      322760   322763       +3     
  Branches    13015    13038      +23     
==========================================
+ Hits       204757   204766       +9     
+ Misses     115361   115358       -3     
+ Partials     2642     2639       -3

Impacted Files	Coverage Δ
src/funcs.c	72.25% <100%> (+1.09%)	⬆️
src/system.c	51.68% <0%> (-0.34%)	⬇️
hpcgap/lib/hpc/stdtasks.g	38.61% <0%> (-0.26%)	⬇️
src/stats.c	73.36% <0%> (-0.14%)	⬇️
src/gap.c	56.03% <0%> (-0.09%)	⬇️
src/hpc/traverse.c	78.29% <0%> (+0.08%)	⬆️
src/hpc/threadapi.c	34.55% <0%> (+0.09%)	⬆️
src/lists.c	55.08% <0%> (+0.11%)	⬆️
src/hpc/thread.c	46.83% <0%> (+0.39%)	⬆️