Get rid of unnecessary macros as they are only ever set to a single thing
diff --git a/common/rfb/rreEncode.h b/common/rfb/rreEncode.h
index 3f83487..e371057 100644
--- a/common/rfb/rreEncode.h
+++ b/common/rfb/rreEncode.h
@@ -18,7 +18,7 @@
//
// RRE encoding function.
//
-// This file is #included after having set the following macros:
+// This file is #included after having set the following macro:
// BPP - 8, 16 or 32
//
// The data argument to RRE_ENCODE contains the pixel data, and it writes the