Fix version modifier

[mkindahl]

The variable VERSION_MOD is used by config.h.

[codecov]

Codecov Report

Merging #3387 (fbb5984) into master (001f5d9) will decrease coverage by 1.55%.
The diff coverage is 88.45%.

@@            Coverage Diff             @@
##           master    #3387      +/-   ##
==========================================
- Coverage   92.17%   90.61%   -1.56%     
==========================================
  Files         110      212     +102     
  Lines       14177    35658   +21481     
==========================================
+ Hits        13067    32310   +19243     
- Misses       1110     3348    +2238     

Impacted Files	Coverage Δ
src/bgw/launcher_interface.c	72.22% <ø> (+1.63%)	⬆️
src/catalog.h	100.00% <ø> (ø)
src/chunk.c	95.90% <ø> (+1.37%)	⬆️
src/chunk.h	100.00% <ø> (ø)
src/chunk_adaptive.c	92.57% <ø> (+2.78%)	⬆️
src/chunk_append/chunk_append.c	97.41% <ø> (+0.90%)	⬆️
src/chunk_append/exec.c	95.84% <ø> (+1.66%)	⬆️
src/chunk_append/explain.c	82.81% <ø> (ø)
src/chunk_append/planner.c	93.38% <ø> (-2.27%)	⬇️
src/chunk_append/transform.c	96.66% <ø> (-3.34%)	⬇️
... and 279 more

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[nikkhils]

LGTM