Emit mspack debug messages to Xenia.

third_party/mspack/logging.cc

@@ -0,0 +1,10 @@
+#include "xenia/base/logging.h"
+
+extern "C" void xenia_log(const char* fmt, ...) {
+  char buffer[128];
+  va_list args;
+  va_start(args, fmt);
+  vsnprintf(buffer, sizeof(buffer), fmt, args);
+  va_end(args);
+  XELOGW("mspack: %s", buffer);
+}

third_party/mspack/lzxd.c

@@ -15,6 +15,11 @@
 #include <system.h>
 #include <lzx.h>
 
+extern void xenia_log(const char*, ...);
+
+#undef D
+#define D(x) do { xenia_log x; } while (0);
+
 /* Microsoft's LZX document (in cab-sdk.exe) and their implementation
  * of the com.ms.util.cab Java package do not concur.
  *