Clean up include paths

Remove runtime/globals.h and make clients point to the right globals.h
(libartbase/base/globals.h).  Also make within-libartbase includes
relative rather than using base/, etc.

Bug: 22322814
Test: make -j 40 checkbuild
Change-Id: I99de63fc851d48946ab401e2369de944419041c7
diff --git a/libartbase/base/arena_object.h b/libartbase/base/arena_object.h
index de7cb64..ed09225 100644
--- a/libartbase/base/arena_object.h
+++ b/libartbase/base/arena_object.h
@@ -20,7 +20,7 @@
 #include <android-base/logging.h>
 
 #include "arena_allocator.h"
-#include "base/macros.h"
+#include "macros.h"
 #include "scoped_arena_allocator.h"
 
 namespace art {