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/bit_string.h b/libartbase/base/bit_string.h
index 0e051f3..d995f8d 100644
--- a/libartbase/base/bit_string.h
+++ b/libartbase/base/bit_string.h
@@ -17,8 +17,8 @@
 #ifndef ART_LIBARTBASE_BASE_BIT_STRING_H_
 #define ART_LIBARTBASE_BASE_BIT_STRING_H_
 
-#include "base/bit_struct.h"
-#include "base/bit_utils.h"
+#include "bit_struct.h"
+#include "bit_utils.h"
 
 #include <ostream>