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/ErrnoRestorer.h b/libc/private/ErrnoRestorer.h
index f467393..52e115a 100644
--- a/libc/private/ErrnoRestorer.h
+++ b/libc/private/ErrnoRestorer.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef ERRNO_RESTORER_H
-#define ERRNO_RESTORER_H
+#pragma once
 
 #include <errno.h>
 
@@ -37,7 +36,5 @@
  private:
   int saved_errno_;
 
-  DISALLOW_COPY_AND_ASSIGN(ErrnoRestorer);
+  BIONIC_DISALLOW_COPY_AND_ASSIGN(ErrnoRestorer);
 };
-
-#endif // ERRNO_RESTORER_H