Revert^2 "Add BUILD_BROKEN_DONT_CHECK_SYSTEMSDK"

5ef2634d5a720228c9b7e09d76c57fec392ccee2

Change-Id: I4430ac4b2411baf3f33695ba3b1520345d7f493d
diff --git a/core/local_systemsdk.mk b/core/local_systemsdk.mk
index fcde700..3307e72 100644
--- a/core/local_systemsdk.mk
+++ b/core/local_systemsdk.mk
@@ -82,8 +82,10 @@
   endif
 
   ifneq ($(_system_sdk_version),$(filter $(_system_sdk_version),$(_supported_systemsdk_versions)))
-    $(call pretty-error,Incompatible LOCAL_SDK_VERSION '$(LOCAL_SDK_VERSION)'. \
-           System SDK version '$(_system_sdk_version)' is not supported. Supported versions are: $(_supported_systemsdk_versions))
+    ifneq (true,$(BUILD_BROKEN_DONT_CHECK_SYSTEMSDK)
+      $(call pretty-error,Incompatible LOCAL_SDK_VERSION '$(LOCAL_SDK_VERSION)'. \
+             System SDK version '$(_system_sdk_version)' is not supported. Supported versions are: $(_supported_systemsdk_versions))
+    endif
   endif
   _system_sdk_version :=
   _supported_systemsdk_versions :=