Fix quadratic complexity performance bug (backport #1657)

[mergify]

This is an automatic backport of pull request #1657 done by Mergify.

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[codecov]

Codecov Report

Merging #1658 (c1d1fc4) into main (bf290e8) will increase coverage by 0.01%.
The diff coverage is 57.44%.

@@            Coverage Diff             @@
##             main    #1658      +/-   ##
==========================================
+ Coverage   66.90%   66.92%   +0.01%     
==========================================
  Files         151      151              
  Lines       20808    20807       -1     
==========================================
+ Hits        13922    13925       +3     
+ Misses       6886     6882       -4     

Impacted Files	Coverage Δ
include/exiv2/pgfimage.hpp	100.00% <ø> (ø)
samples/Jzon.cpp	34.05% <0.00%> (ø)
src/bmpimage.cpp	25.00% <ø> (ø)
src/casiomn_int.cpp	7.14% <ø> (ø)
src/convert.cpp	69.06% <0.00%> (ø)
src/cr2header_int.cpp	77.14% <ø> (ø)
src/crwimage_int.cpp	87.31% <ø> (ø)
src/epsimage.cpp	2.00% <0.00%> (ø)
src/error.cpp	89.74% <ø> (ø)
src/exif.cpp	76.26% <ø> (ø)
... and 46 more

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[piponazo]

Github Actions are not working well today. Let's way until is back to determine if the CI jobs pass.