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_test.cc b/libartbase/base/bit_string_test.cc
index 23274e3..89a71a1 100644
--- a/libartbase/base/bit_string_test.cc
+++ b/libartbase/base/bit_string_test.cc
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "base/bit_string.h"
+#include "bit_string.h"
 
 #include "gtest/gtest.h"
 #include "android-base/logging.h"