Revert "Generate the NDK docs with the ndk-docs target."

This reverts commit d51b6d0d75adff6de4e1373f52b1d8aad3c1032c.

Reason for revert: Broke all unbundled builds

Change-Id: Id6722a076ee91ca150b1a53935632579c6f6f6dd
diff --git a/core/Makefile b/core/Makefile
index 379d08a..4b15f3c 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -70,25 +70,6 @@
 	@cp -f $< $@
 endif
 
-ndk_doxygen_out := $(OUT_NDK_DOCS)
-ndk_headers := $(SOONG_OUT_DIR)/ndk/sysroot/usr/include
-ndk_docs_src_dir := frameworks/native/docs
-ndk_doxyfile := $(ndk_docs_src_dir)/Doxyfile
-ndk_docs_srcs := $(addprefix $(ndk_docs_src_dir)/,\
-    $(call find-files-in-subdirs,$(ndk_docs_src_dir),"*",.))
-$(ndk_doxygen_out)/index.html: $(ndk_docs_srcs) $(SOONG_OUT_DIR)/ndk.timestamp
-	@mkdir -p $(ndk_doxygen_out)
-	@echo "Generating NDK docs to $(ndk_doxygen_out)"
-	@( cat $(ndk_doxyfile); \
-		echo "INPUT=$(ndk_headers)"; \
-		echo "HTML_OUTPUT=$(ndk_doxygen_out)" \
-	) | doxygen -
-
-# Note: Not a part of the docs target because we don't have doxygen available.
-# You can run this target locally if you have doxygen installed.
-ndk-docs: $(ndk_doxygen_out)/index.html
-.PHONY: ndk-docs
-
 # -----------------------------------------------------------------
 # property_overrides_split_enabled
 property_overrides_split_enabled :=
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 4e3db0c..c99c70f 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -343,7 +343,6 @@
 PRODUCT_OUT := $(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE)
 
 OUT_DOCS := $(TARGET_COMMON_OUT_ROOT)/docs
-OUT_NDK_DOCS := $(TARGET_COMMON_OUT_ROOT)/ndk-docs
 
 BUILD_OUT_EXECUTABLES := $(BUILD_OUT)/bin
 SOONG_HOST_OUT_EXECUTABLES := $(SOONG_HOST_OUT)/bin