Adapting last changes to OS400:

_ Updated packages/OS400/curl.inc.in with new definitions.
_ New connect/bind/sendto/recvfrom wrappers to support AF_UNIX sockets.
_ Include files line length shortened below 100 chars.
_ Const parameter in lib/qssl.[ch].
_ Typos in packages/OS400/initscript.sh.

lib/config-os400.h

@@ -322,6 +322,9 @@
 /* Define if you have the <sys/types.h> header file. */
 #define HAVE_SYS_TYPES_H
 
+/* Define if you have the <sys/un.h> header file. */
+#define HAVE_SYS_UN_H
+
 /* Define if you have the <sys/ioctl.h> header file. */
 #define HAVE_SYS_IOCTL_H
 
@@ -379,6 +382,9 @@
 
 #define SIZEOF_CURL_OFF_T 8
 
+/* Define this if you have struct sockaddr_storage */
+#define HAVE_STRUCT_SOCKADDR_STORAGE
+
 /* Define if you have the ANSI C header files. */
 #define STDC_HEADERS