Use C-style cast in SIMDE_CAST_ALIGN
Use C-style cast in SIMDE_CAST_ALIGN

This would require multiple C++-style casts, and I don't want to get
into that until we test properly in C++.  This may trigger some
off-by-default diagnostics from clang and IAR, but there are already
a lot of C-style casts in SIMDe so it probably won't make much
difference.

nemequ/simde,nemequ/simde,nemequ/simde