Strip final 0x1A character in the input file, if found.

[st-pasha]

Closes #1612

[codecov-io]

Codecov Report

Merging #2253 into master will increase coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2253      +/-   ##
==========================================
+ Coverage   90.72%   90.84%   +0.12%     
==========================================
  Files          59       59              
  Lines       11509    11526      +17     
==========================================
+ Hits        10441    10471      +30     
+ Misses       1068     1055      -13

Impacted Files	Coverage Δ
src/fread.c	93.45% <100%> (+0.11%)	⬆️
src/forder.c	94.47% <0%> (+0.78%)	⬆️
src/bmerge.c	96.92% <0%> (+1.95%)	⬆️

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