Revert^2 "Add BUILD_BROKEN_DONT_CHECK_SYSTEMSDK"

5ef2634d5a720228c9b7e09d76c57fec392ccee2

Change-Id: I4430ac4b2411baf3f33695ba3b1520345d7f493d
diff --git a/core/board_config.mk b/core/board_config.mk
index ae11eb6..5a1a781 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -186,6 +186,7 @@
   BUILD_BROKEN_VINTF_PRODUCT_COPY_FILES \
   BUILD_BROKEN_INCORRECT_PARTITION_IMAGES \
   BUILD_BROKEN_GENRULE_SANDBOXING \
+  BUILD_BROKEN_DONT_CHECK_SYSTEMSDK \
 
 _build_broken_var_list += \
   $(foreach m,$(AVAILABLE_BUILD_MODULE_TYPES) \