Only use get_ds_base function on true Windows.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+Thu Sep 18 15:07:46 1997  Andrew Cagney  <cagney@b1.cygnus.com>
+
+	* ser-e7kpc.c (get_ds_base): Only use under Windows.
+	(windows.h): Include when any _WIN32 host.
+
 Wed Sep 24 18:12:47 1997  Stu Grossman  <grossman@babylon-5.cygnus.com>
 
 	* The following block of changes add support for debugging assembly

gdb/ser-e7kpc.c

@@ -27,6 +27,9 @@
 #ifdef _MSC_VER
 #define strncasecmp strnicmp
 #define WIN32_LEAN_AND_MEAN
+#endif
+
+#ifdef _WIN32
 #include <windows.h>
 #endif
 
@@ -110,7 +113,7 @@ static struct sw
   {0x17, 0xdc000},
   0};
 
-#ifndef __GO32__
+#ifdef _MSC_VER
 /* Get the base of the data segment.  This is needed to calculate the offset
    between data segment addresses and the base of linear memory, which is where
    device registers reside.  Note that this is really only necessary for
@@ -137,9 +140,9 @@ get_ds_base (void)
 
   return dsbase;
 }
-#else /* !__GO32__ */
+#else /* !_MSC_VER */
 #define get_ds_base() 0
-#endif /* __GO32__ */ 
+#endif /* _MSC_VER */ 
 
 static int
 e7000pc_init ()