posix: remove performance hack for pre-1.3 pmemobj

[marcinslusarz]

This change is 

[krzycz]

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Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[codecov[bot]]

Codecov Report

Merging #385 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #385      +/-   ##
==========================================
+ Coverage   76.91%   76.94%   +0.03%     
==========================================
  Files          67       67              
  Lines        8261     8260       -1     
  Branches     1658     1658              
==========================================
+ Hits         6354     6356       +2     
  Misses       1489     1489              
+ Partials      418      415       -3

Flag	Coverage Δ
#ltp_tests	46.5% <100%> (+0.82%)	:arrow_up:
#sqlite_tests	45.25% <100%> (ø)	:arrow_up:
#tests_antool	14.72% <0%> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.1% <100%> (+0.01%)	:arrow_up:
#tests_posix_single_threaded	54.28% <100%> (-0.04%)	:arrow_down:
#tests_preload	44.8% <100%> (ø)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/block_array.c	96.74% <100%> (+2.39%)	:arrow_up:
src/libpmemfile-posix/utils.c	70% <0%> (-1.67%)	:arrow_down:
src/libpmemfile-posix/dir.c	84.76% <0%> (-0.25%)	:arrow_down:
src/libpmemfile-posix/data.c	93.62% <0%> (ø)	:arrow_up:
src/libpmemfile-posix/blocks.c	70% <0%> (+5%)	:arrow_up:

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[sarahjelinek]

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Reviewed 1 of 1 files at r1. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable