standardise mspack source file layout

src/xenia/cpu/lzx.cc

@@ -18,8 +18,8 @@
 #include "xenia/base/memory.h"
 #include "xenia/kernel/util/xex2_info.h"
 
-#include "third_party/mspack/lzx.h"
-#include "third_party/mspack/mspack.h"
+#include "third_party/mspack/include/mspack/lzx.h"
+#include "third_party/mspack/include/mspack/mspack.h"
 
 typedef struct mspack_memory_file_t {
   mspack_system sys;

third_party/mspack.lua

@@ -18,14 +18,14 @@ project("mspack")
       "mspack",
   })
   files({
-      "mspack/logging.cc",
-      "mspack/lzx.h",
-      "mspack/lzxd.c",
-      "mspack/mspack.h",
-      "mspack/readbits.h",
-      "mspack/readhuff.h",
-      "mspack/system.c",
-      "mspack/system.h",
+    "mspack/include/mspack/lzx.h",
+    "mspack/include/mspack/mspack.h",
+    "mspack/include/mspack/readbits.h",
+    "mspack/include/mspack/readhuff.h",
+    "mspack/include/mspack/system.h",
+    "mspack/mspack/logging.cc",
+    "mspack/mspack/lzxd.c",
+    "mspack/mspack/system.c",
   })
 
   filter("platforms:Windows")