Use the real gethostid on Solaris. (#121)

* Use the real gethostid on Solaris.

Solaris has this, so we might as well use it like we do on other
platforms. This value is used in response to queries from it from
Lisp.

* Improve undefining of HAS_GETHOSTID.

Enable it on Solaris in `inc/version.h`. This file already
disables it on DOS, so no need to do so again in `src/initsout.c`.

inc/version.h

@@ -231,7 +231,6 @@ typedef signed char s_char;
 	/********************************************************/
 #ifdef OS5
 		/* Solaris, sort of SYSV-ish, but not really */
-#undef HAS_GETHOSTID
 #define SYSVSIGNALS 1
 #define NOFORN
 #define LOCK_X_UPDATES 1

src/initsout.c

@@ -24,9 +24,7 @@
 
 #ifndef DOS
 #include <pwd.h>
-#else
-#undef HAS_GETHOSTID
-#endif /* DOS */
+#endif
 
 #include "hdw_conf.h"
 #include "lispemul.h"

src/uutils.c

@@ -40,10 +40,6 @@
 #include "osmsgdefs.h"
 #include "uraiddefs.h"
 
-#ifdef OS5
-#define gethostid() 0
-#endif /* OS5 */
-
 /************************************************************************/
 /*									*/
 /*		l i s p _ s t r i n g _ t o _ c _ s t r i n g		*/