supertux2: fix build on big endian

Author: q66

srcpkgs/supertux2/patches/endian.patch

@@ -0,0 +1,19 @@
+commit ab3daa606e215f43aa3077daad82cd2d55c38908
+Author: q66 <daniel@octaforge.org>
+Date:   Mon Jan 6 03:02:59 2020 +0100
+
+    Fix build on big endian
+
+diff --git src/audio/wav_sound_file.cpp src/audio/wav_sound_file.cpp
+index c4036b1..e056f50 100644
+--- src/audio/wav_sound_file.cpp
++++ src/audio/wav_sound_file.cpp
+@@ -150,7 +150,7 @@ WavSoundFile::read(void* buffer, size_t buffer_size)
+     throw SoundError("read error while reading samples");
+ 
+ #ifdef WORDS_BIGENDIAN
+-  if (bits_per_sample != 16)
++  if (m_bits_per_sample != 16)
+     return readsize;
+   char *tmp = (char*)buffer;
+