Remove old build-tools/platform-tools SDK implementation

Since those were the only components of the Windows SDK, this removes a
lot of special casing around that as well.

Bug: 187222815
Change-Id: I2690aadcf78e9ccad43314c8475893e81a2e2735
diff --git a/core/main.mk b/core/main.mk
index e3aa996..a2d76aa 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -359,7 +359,7 @@
 
 is_sdk_build :=
 
-ifneq ($(filter sdk win_sdk sdk_addon,$(MAKECMDGOALS)),)
+ifneq ($(filter sdk sdk_addon,$(MAKECMDGOALS)),)
 is_sdk_build := true
 endif
 
@@ -1914,11 +1914,11 @@
 .PHONY: docs
 docs: $(ALL_DOCS)
 
-.PHONY: sdk win_sdk winsdk-tools sdk_addon
+.PHONY: sdk sdk_addon
 ifeq ($(HOST_OS),linux)
 ALL_SDK_TARGETS := $(INTERNAL_SDK_TARGET)
 sdk: $(ALL_SDK_TARGETS)
-$(call dist-for-goals,sdk win_sdk, \
+$(call dist-for-goals,sdk, \
     $(ALL_SDK_TARGETS) \
     $(SYMBOLS_ZIP) \
     $(COVERAGE_ZIP) \