Clean up some kati warnings

Kati has a `--warn` option that adds some extra Kati-specific warnings
-- like using undefined make functions, undefined user functions, likely
bad variable lookups, etc. Some of these are bugs, others are fine doing
nothing. This fixes up all of them in the core build system.

It also complains about $(eval) usage in a recipe not being recommended.
Those aren't handled as part of this change.

Bug: 72661763
Test: build-aosp_arm.ninja is identical before and after
Change-Id: I8e00af142a7745236d3ad4efc9e91ec3ce71a511
diff --git a/core/aux_config.mk b/core/aux_config.mk
index 41c14ae..bdae86a 100644
--- a/core/aux_config.mk
+++ b/core/aux_config.mk
@@ -102,10 +102,10 @@
 $(eval AUX_OS_VARIANT_LIST_$(AUX_OS_$(1)):=) \
 $(call aux-variant-setup-paths,$(_name)) \
 $(eval AUX_ALL_VARIANTS += $(_name)) \
-$(eval AUX_ALL_OSES := $(filterout $(AUX_OS_$(_name)),$(AUX_ALL_OSES)) $(AUX_OS_$(_name))) \
-$(eval AUX_ALL_CPUS := $(filterout $(AUX_CPU_$(_name)),$(AUX_ALL_CPUS)) $(AUX_CPU_$(_name))) \
-$(eval AUX_ALL_ARCHS := $(filterout $(AUX_ARCH_$(_name)),$(AUX_ALL_ARCHS)) $(AUX_ARCH_$(_name))) \
-$(eval AUX_ALL_SUBARCHS := $(filterout $(AUX_SUBARCH_$(_name)),$(AUX_ALL_SUBARCHS)) $(AUX_SUBARCH_$(_name)))
+$(eval AUX_ALL_OSES := $(filter-out $(AUX_OS_$(_name)),$(AUX_ALL_OSES)) $(AUX_OS_$(_name))) \
+$(eval AUX_ALL_CPUS := $(filter-out $(AUX_CPU_$(_name)),$(AUX_ALL_CPUS)) $(AUX_CPU_$(_name))) \
+$(eval AUX_ALL_ARCHS := $(filter-out $(AUX_ARCH_$(_name)),$(AUX_ALL_ARCHS)) $(AUX_ARCH_$(_name))) \
+$(eval AUX_ALL_SUBARCHS := $(filter-out $(AUX_SUBARCH_$(_name)),$(AUX_ALL_SUBARCHS)) $(AUX_SUBARCH_$(_name)))
 endef
 
 # Load system configuration referenced by AUX variant config;
@@ -138,7 +138,7 @@
 $(eval _all:=) \
 $(eval _req:=$(addsuffix _$(1),$(aux_env))) \
 $(foreach var,$(_req),$(eval _all += $(var))) \
-$(eval _missing := $(filterout $(_all),$(_req))) \
+$(eval _missing := $(filter-out $(_all),$(_req))) \
 $(if $(_missing),$(error AUX variant $(1) must define vars: $(_missing)))
 endef