message: feat(makefile) Remove extra spaces in `compilers` and `compilers_engines`.
diff: @@ -161,6 +161,9 @@ ifneq (, $(findstring singlepass,$(compilers)))
  HAS_SINGLEPASS := 1
  endif
  +# Clean the `compilers` variable.
  +compilers := $(strip $(compilers))
  +
  #####
  #
  @@ -216,6 +219,9 @@ ifeq ($(HAS_SINGLEPASS), 1)
  endif
  endif
  +# Clean the `compilers_engines` variable.
  +compilers_engines := $(strip $(compilers_engines))
  +
  #####
  #
  @@ -259,7 +265,7 @@ space := $() $()
  comma := ,
  # Define the default Cargo features for all crates.
  -compiler_features := --features $(subst $(space),$(comma),$(strip $(compilers)))
  +compiler_features := --features $(subst $(space),$(comma),$(compilers))
  #####
  