Revert "Removed unused macro around now commented 'max_bits' vars"

This reverts commit 0a7098a231b780d1136d34368407178deddb36af.
diff --git a/contrib/single_file_transcoder/examples/simple.cpp b/contrib/single_file_transcoder/examples/simple.cpp
index 17d52cd..9f61c26 100644
--- a/contrib/single_file_transcoder/examples/simple.cpp
+++ b/contrib/single_file_transcoder/examples/simple.cpp
@@ -11,7 +11,7 @@
  * 
  * Example code released under a CC0 license.
  */
-#include "../../../transcoder/basisu_transcoder.h"
+#include "../basisu_transcoder.cpp"
 
 using namespace basist;
 
diff --git a/transcoder/basisu_transcoder.cpp b/transcoder/basisu_transcoder.cpp
index 1d6a46e..574e33f 100644
--- a/transcoder/basisu_transcoder.cpp
+++ b/transcoder/basisu_transcoder.cpp
@@ -3388,6 +3388,7 @@
 		const uint32_t min_bits = basisu::minimum(x_bits, y_bits);
 		//const uint32_t max_bits = basisu::maximum(x_bits, y_bits);
 		const uint32_t swizzle_mask = (1 << (min_bits * 2)) - 1;
+		BASISU_NOTE_UNUSED(max_bits);
 
 		uint32_t block_index = 0;
 
@@ -3569,6 +3570,7 @@
 		const uint32_t min_bits = basisu::minimum(x_bits, y_bits);
 		//const uint32_t max_bits = basisu::maximum(x_bits, y_bits);
 		const uint32_t swizzle_mask = (1 << (min_bits * 2)) - 1;
+		BASISU_NOTE_UNUSED(max_bits);
 
 		uint32_t block_index = 0;