Change mode of incbin.h

Keep incbin.h with the same mode as the other source files.

A mode diff might show up when working with patch files or sending the source code between devices.
This patch should fix such behaviour.

closes https://github.com/official-stockfish/Stockfish/pull/4442

No functional change

diff --git a/src/incbin/incbin.h b/src/incbin/incbin.h
old mode 100755 (executable)
new mode 100644 (file)