Remove unused ALIGN macro

[WOnder93]

The 'ALIGN' macro defined in core.h is not used anywhere, so it can be removed.

[codecov-io]

Codecov Report

Merging #206 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #206      +/-   ##
==========================================
+ Coverage   67.85%   67.93%   +0.08%     
==========================================
  Files           9        9              
  Lines        1014     1023       +9     
  Branches      167      167              
==========================================
+ Hits          688      695       +7     
- Misses        246      248       +2     
  Partials       80       80

Impacted Files	Coverage Δ
src/core.c	64.62% <0%> (-0.09%)	⬇️
src/opt.c	92.94% <0%> (+0.34%)	⬆️

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[josephlr]

It looks like this used to be used to align the block struct, so it would have a 128 bit alignment. This is because the optimized implementation would consider a block as an array of __m128i. But this was broken anyway because the memory allocator does not give the proper 128-bit alignment. I say remove the macro and deal with the alignment issues later.

[sneves]

Alright, merged.