Add stubs for AliceLogo4 library

Used in Vanish!

src/ffi.c

@@ -142,6 +142,7 @@ extern struct static_library lib_ADVSYS;
 extern struct static_library lib_AliceLogo;
 extern struct static_library lib_AliceLogo2;
 extern struct static_library lib_AliceLogo3;
+extern struct static_library lib_AliceLogo4;
 extern struct static_library lib_BanMisc;
 extern struct static_library lib_Bitarray;
 extern struct static_library lib_Confirm;
@@ -177,6 +178,7 @@ static struct static_library *static_libraries[] = {
 	&lib_AliceLogo,
 	&lib_AliceLogo2,
 	&lib_AliceLogo3,
+	&lib_AliceLogo4,
 	&lib_BanMisc,
 	&lib_Bitarray,
 	&lib_Confirm,

src/hll/AliceLogo4.c

@@ -0,0 +1,26 @@
+/* Copyright (C) 2019 Nunuhara Cabbage <nunuhara@haniwa.technology>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://gnu.org/licenses/>.
+ */
+
+#include "hll.h"
+
+HLL_WARN_UNIMPLEMENTED(1, int,  AliceLogo4, Init, void *imainsystem);
+HLL_WARN_UNIMPLEMENTED( , void, AliceLogo4, SetWaveNum, int n, int wave);
+HLL_WARN_UNIMPLEMENTED( , void, AliceLogo4, Run, int type, int loop_flag);
+
+HLL_LIBRARY(AliceLogo4,
+	    HLL_EXPORT(Init, AliceLogo4_Init),
+	    HLL_EXPORT(SetWaveNum, AliceLogo4_SetWaveNum),
+	    HLL_EXPORT(Run, AliceLogo4_Run));

src/meson.build

@@ -22,6 +22,7 @@ xsystem4 = ['audio.c',
             'hll/AliceLogo.c',
             'hll/AliceLogo2.c',
             'hll/AliceLogo3.c',
+            'hll/AliceLogo4.c',
             'hll/BanMisc.c',
             'hll/Bitarray.c',
             'hll/Confirm.c',