Clean up bionic_macros.h a bit.

Use <android-base/macros.h> instead where possible, and move the bionic
macros out of the way of the libbase ones. Yes, there are folks who manage
to end up with both included at once (thanks OpenGL!), and cleaning that
up doesn't seem nearly as practical as just making this change.

Bug: N/A
Test: builds
Change-Id: I23fc544f39d5addf81dc61471771a5438778895b
diff --git a/libc/private/ScopedPthreadMutexLocker.h b/libc/private/ScopedPthreadMutexLocker.h
index 58462e3..1c1e4a7 100644
--- a/libc/private/ScopedPthreadMutexLocker.h
+++ b/libc/private/ScopedPthreadMutexLocker.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef SCOPED_PTHREAD_MUTEX_LOCKER_H
-#define SCOPED_PTHREAD_MUTEX_LOCKER_H
+#pragma once
 
 #include <pthread.h>
 
@@ -34,7 +33,5 @@
  private:
   pthread_mutex_t* mu_;
 
-  DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedPthreadMutexLocker);
+  BIONIC_DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedPthreadMutexLocker);
 };
-
-#endif // SCOPED_PTHREAD_MUTEX_LOCKER_H