Update RenderScript build config and definitions.

Bug: 38342163

  - obj/lib is deprecated and TARGET_OUT_INTERMEDIATE_LIBRARIES will be
  removed. We need to use per-module intermediates directory instead.
  - prebuilts/ndk/current folder is gone. For libm and libc, we just
  need ndk/r10 as stub libs for linking.

Test: mm and made sure this does not affect on device target.
Test: make -j50 FORCE_BUILD_RS_COMPAT=true RSTest_Compat works as
expected.

Change-Id: I8fbf5c10322707849a23c6b0dacc28b028db451e
diff --git a/core/config.mk b/core/config.mk
index 42f6148..6a52ea7 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -824,10 +824,10 @@
 RS_PREBUILT_CLCORE := prebuilts/sdk/renderscript/lib/$(TARGET_ARCH)/librsrt_$(TARGET_ARCH).bc
 RS_PREBUILT_COMPILER_RT := prebuilts/sdk/renderscript/lib/$(TARGET_ARCH)/libcompiler_rt.a
 ifeq (true,$(TARGET_IS_64_BIT))
-RS_PREBUILT_LIBPATH := -L prebuilts/ndk/current/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib64 \
-                       -L prebuilts/ndk/current/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib
+RS_PREBUILT_LIBPATH := -L prebuilts/ndk/r10/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib64 \
+                       -L prebuilts/ndk/r10/platforms/android-21/arch-$(TARGET_ARCH)/usr/lib
 else
-RS_PREBUILT_LIBPATH := -L prebuilts/ndk/current/platforms/android-9/arch-$(TARGET_ARCH)/usr/lib
+RS_PREBUILT_LIBPATH := -L prebuilts/ndk/r10/platforms/android-9/arch-$(TARGET_ARCH)/usr/lib
 endif
 
 # API Level lists for Renderscript Compat lib.