winealsa: Move get_endpoints_id to the unixlib.

dlls/winealsa.drv/Makefile.in

 EXTRADEFS = -DWINE_NO_LONG_TYPES
 MODULE    = winealsa.drv
+UNIXLIB   = winealsa.so
 IMPORTS   = uuid ole32 advapi32
 DELAYIMPORTS = winmm
 EXTRALIBS = $(ALSA_LIBS)
@@ -7,5 +8,6 @@ EXTRALIBS = $(ALSA_LIBS)
 EXTRADLLFLAGS = -mcygwin
 
 C_SRCS = \
+	alsa.c \
 	midi.c \
 	mmdevdrv.c

dlls/winealsa.drv/unixlib.h

+/*
+ * Copyright 2022 Huw Davies
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+struct endpoint
+{
+    WCHAR *name;
+    char *device;
+};
+
+struct get_endpoint_ids_params
+{
+    EDataFlow flow;
+    struct endpoint *endpoints;
+    unsigned int size;
+    HRESULT result;
+    unsigned int num;
+    unsigned int default_idx;
+};
+
+enum alsa_funcs
+{
+    alsa_get_endpoint_ids,
+};
+
+extern unixlib_handle_t alsa_handle;
+
+#define ALSA_CALL(func, params) __wine_unix_call(alsa_handle, alsa_ ## func, params)