BUILD: makefile: sort the features list
The features list that appears in -vv appears in a random order, which
always makes it a pain to look for certain features. Let's sort it.
diff --git a/include/make/options.mk b/include/make/options.mk
index 4179e9a..db4502c 100644
--- a/include/make/options.mk
+++ b/include/make/options.mk
@@ -23,7 +23,7 @@
# Make a list of all known features with +/- prepended depending on their
# activation status. Must be a macro so that dynamically enabled ones are
# evaluated with their current status.
-build_features = $(foreach opt,$(patsubst USE_%,%,$(use_opts)),$(if $(USE_$(opt)),+$(opt),-$(opt)))
+build_features = $(foreach opt,$(patsubst USE_%,%,$(sort $(use_opts))),$(if $(USE_$(opt)),+$(opt),-$(opt)))
# This returns a list of -DUSE_* for all known USE_* that are set
opts_as_defines = $(foreach opt,$(use_opts),$(if $($(opt)),-D$(opt),))