Fix build on Windows + minor style fixes
Created by: nemo-cpt
This fixes Windows link issues:
fastops-fastops-avx.lib(ops_avx.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castps_si256
fastops-fastops-avx2.lib(ops_avx2.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castps_si256
fastops-fastops-avx.lib(ops_avx.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castpd_si256
fastops-fastops-avx2.lib(ops_avx2.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castpd_si256
fastops-fastops-avx.lib(ops_avx.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castsi256_ps
fastops-fastops-avx2.lib(ops_avx2.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castsi256_ps
fastops-fastops-avx.lib(ops_avx.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castsi256_pd
fastops-fastops-avx2.lib(ops_avx2.cpp.obj) : error LNK2001: unresolved external symbol _mm256_castsi256_pd
contrib/libs/fastops/fastops/ut/bin/fastops_test.exe : fatal error LNK1120: 4 unresolved externals
Basically these intrinsics are not exactly functions and so just disappear without anything one may take address of. Wrapping into lambda saves the day.
Tested to work with clangs and gccs, so added unconditionally.