Add initial visual studio project files and fix the win32 build

Win32 has been rotting for a while. This patch adds vs17 build files
as well as fixing up all build errors that have accumulated.
There are still build warnings but those can be addressed in a followup
patch.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

lib/iser.c

@@ -34,6 +34,13 @@
 
 #ifdef __linux
 
+/* MUST keep in sync with socket.c */
+union socket_address {
+	struct sockaddr_in sin;
+	struct sockaddr_in6 sin6;
+	struct sockaddr sa;
+};
+
 static int cq_handle(struct iser_conn *iser_conn);
 
 /*