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/utils.h b/libartbase/base/utils.h
index c8c5b72..73c1c22 100644
--- a/libartbase/base/utils.h
+++ b/libartbase/base/utils.h
@@ -25,11 +25,11 @@
 
 #include <android-base/logging.h>
 
-#include "base/casts.h"
-#include "base/enums.h"
-#include "base/globals.h"
-#include "base/macros.h"
-#include "base/stringpiece.h"
+#include "casts.h"
+#include "enums.h"
+#include "globals.h"
+#include "macros.h"
+#include "stringpiece.h"
 
 namespace art {