Clean up abort.

* A dlmalloc usage error shouldn't call abort(3) because we want to
  cause a SIGSEGV by writing the address dlmalloc didn't like to an
  address the kernel won't like, so that debuggerd will dump the
  memory around the address that upset dlmalloc.

* Switch to the simpler FreeBSD/NetBSD style of registering stdio
  cleanup. Hopefully this will let us simplify more of the stdio
  implementation.

* Clear the stdio cleanup handler before we abort because of a dlmalloc
  corruption error. This fixes the reported bug, where we'd hang inside
  dlmalloc because the stdio cleanup reentered dlmalloc.

Bug: 9301265
Change-Id: Ief31b389455d6876e5a68f0f5429567d37277dbc
diff --git a/libc/Android.mk b/libc/Android.mk
index c98bf9e..49d93af 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -6,7 +6,6 @@
 # =========================================================
 libc_common_src_files := \
 	$(syscall_src) \
-	unistd/abort.c \
 	unistd/alarm.c \
 	unistd/exec.c \
 	unistd/fnmatch.c \
@@ -192,6 +191,7 @@
 	netbsd/nameser/ns_samedomain.c \
 
 libc_bionic_src_files := \
+    bionic/abort.cpp \
     bionic/assert.cpp \
     bionic/brk.cpp \
     bionic/dirent.cpp \