SWORD25: Fixing bug #7041: SWORD25: Crash in final scene

The original was ignoring Lua errors in that scene and was
restoring the state with longjmp.

We are yet to see the platform compatibility, but Lua's code
is too tangled to make simple replacement with error() work.

Another possible alternative would be to rework the original
game scripts. We will do it if this commit is problematic.

engines/sword25/util/lua/ldo.cpp

@@ -111,10 +111,9 @@ static const char* luaErrorDescription[] = {
 void luaD_throw (lua_State *L, int errcode) {
   if (L->errorJmp) {
     L->errorJmp->status = errcode;
-    // LUAI_THROW has been replaced with an error message in ScummVM, together
-    // with the LUA error code and description
-    //LUAI_THROW(L, L->errorJmp);
-    error("LUA error occured, error code is %d (%s)", errcode, luaErrorDescription[errcode]);
+    // LUAI_THROW is sometimes used to ignore the error and restore LUA state
+    LUAI_THROW(L, L->errorJmp);
+    error("LUA error occurred, error code is %d (%s)", errcode, luaErrorDescription[errcode]);
   }
   else {
     L->status = cast_byte(errcode);

engines/sword25/util/lua/luaconf.h

@@ -621,7 +621,7 @@ union luai_Cast { double l_d; long l_l; };
 
 #else
 /* default handling with long jumps */
-//#define LUAI_THROW(L,c)	longjmp((c)->b, 1)	// replaced with error() in ScummVM
+#define LUAI_THROW(L,c)	longjmp((c)->b, 1)
 #define LUAI_TRY(L,c,a)	if (setjmp((c)->b) == 0) { a }
 #define luai_jmpbuf	jmp_buf