message: feat(makefile) Use comma to separate Cargo features in `compiler_features`.
diff: @@ -254,9 +254,12 @@ ifeq ($(use_system_ffi), 1)
  capi_default_features := --features system-libffi
  endif
  +# Small trick to define a space and a comma.
  +space := $() $()
  +comma := ,
  +
  # Define the default Cargo features for all crates.
  -compiler_features_spaced := $(foreach compiler,$(compilers),$(compiler))
  -compiler_features := --features "$(compiler_features_spaced)"
  +compiler_features := --features $(subst $(space),$(comma),$(strip $(compilers)))
  #####
  