Add PR_SET_VMA and PR_SET_VMA_ANON_NAME to <sys/prctl.h>.

We've copied & pasted these to too many places. And if we're going to
have another go at upstreaming these, that's probably yet another reason
to have the *values* in just one place. (Even if upstream wants different
names, we'll likely keep the legacy names around for a while for source
compatibility.)

Bug: http://b/111903542
Test: ran tests
Change-Id: I8ccc557453d69530e5b74f865cbe0b458c84e3ba
diff --git a/linker/linker_allocator.h b/linker/linker_allocator.h
index 82e4ef4..8c4198b 100644
--- a/linker/linker_allocator.h
+++ b/linker/linker_allocator.h
@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <sys/cdefs.h>
 #include <sys/mman.h>
+#include <sys/prctl.h>
 #include <stddef.h>
 #include <unistd.h>
 
@@ -39,8 +40,6 @@
 
 #include <async_safe/log.h>
 
-#include "private/bionic_prctl.h"
-
 const uint32_t kSmallObjectMaxSizeLog2 = 10;
 const uint32_t kSmallObjectMinSizeLog2 = 4;
 const uint32_t kSmallObjectAllocatorsCount = kSmallObjectMaxSizeLog2 - kSmallObjectMinSizeLog2 + 1;