Enable LLVM_RS_LINK. No longer forking an LLVM linker inside llvm-rs-cc.

Change-Id: I2ebc6ec759daf36d1e77fa8e30147ab8e40b44fc
diff --git a/core/config.mk b/core/config.mk
index 85cc761..c03f44a 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -222,6 +222,7 @@
 PROGUARD := external/proguard/bin/proguard.sh
 JAVATAGS := build/tools/java-event-log-tags.py
 LLVM_RS_CC := $(HOST_OUT_EXECUTABLES)/llvm-rs-cc$(HOST_EXECUTABLE_SUFFIX)
+LLVM_RS_LINK := $(HOST_OUT_EXECUTABLES)/llvm-rs-link$(HOST_EXECUTABLE_SUFFIX)
 DEXOPT := $(HOST_OUT_EXECUTABLES)/dexopt$(HOST_EXECUTABLE_SUFFIX)
 DEXPREOPT := dalvik/tools/dex-preopt