Enable __cxa_atexit && __cxa_finalize for linker

 This allows adding destructors to classes used
 for global variables.

(cherry picked from commit 14241402de0faa4b244b1bd6b1f0799ce169b880)

Change-Id: I1d8776130d1e01a8c53d23a2949f5010f4c96b16
diff --git a/linker/Android.mk b/linker/Android.mk
index 5853c90..4298032 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -8,6 +8,7 @@
     linker.cpp \
     linker_allocator.cpp \
     linker_environ.cpp \
+    linker_libc_support.c \
     linker_phdr.cpp \
     rt.cpp \