Eli Schwartz
29e44bc554
Regression from commit a5f2c45528. It is
not possible to unconditionally add the asm sources, since not all
compilers understand the .s file extension.
Specifically for meson, only compilers inheriting from the GNU mixin
will allow a .s file at configure time.
zstd doesn't support asm for MSVC for the same basic reason; if/when
Windows asm support is added, it would involve preprocessing with nasm,
most likely.