Merge pull request #412 from Skullheadx/Fix-Missing-cfloat-Include

Fix missing cfloat include in basisu_astc_hdr_6x6_enc.cpp

Author: richgel999

encoder/basisu_astc_hdr_6x6_enc.cpp

@@ -13,6 +13,7 @@
 #include "3rdparty/android_astc_decomp.h"
 
 #include <array>
+#include <cfloat>
 
 using namespace basisu;
 using namespace buminiz;