deal with some win/win32 warnings

win/win32/mhdlg.c(137)   : warning C4456: declaration of 'wbuf' hides
                           previous local declaration
win/win32/mhdlg.c(62)    : note: see declaration of 'wbuf'
win/win32/mhdlg.c(875)   : warning C4189: 'gender': local variable is
                           initialized but not referenced
win/win32/mhdlg.c(874)   : warning C4189: 'race': local variable is
                           initialized but not referenced
win/win32/mhdlg.c(876)   : warning C4189: 'alignment': local variable is
                           initialized but not referenced
win/win32/mhdlg.c(873)   : warning C4189: 'role': local variable is
                           initialized but not referenced
win/win32/mhinput.h(24)  : warning C4201: nonstandard extension used:
                           nameless struct/union
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhinput.h(24)  : warning C4201: nonstandard extension used:
                           nameless struct/union
win/win32/mhinput.h(24)  : warning C4201: nonstandard extension used:
                           nameless struct/union
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhmenu.c(62)   : warning C4201: nonstandard extension used:
                           nameless struct/union
win/win32/mhmenu.c(1082) : warning C4456: declaration of 'monitorScale'
                           hides previous local declaration
win/win32/mhmenu.c(995)  : note: see declaration of 'monitorScale'
win/win32/mhmenu.c(1142) : warning C4456: declaration of 'wbuf' hides
                           previous local declaration
win/win32/mhmenu.c(986)  : note: see declaration of 'wbuf'
win/win32/mhmenu.c(1082) : warning C4189: 'monitorScale': local variable
                           is initialized but not referenced
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhmsgwnd.c(700): warning C4701: potentially uninitialized
                           local variable 'size' used
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhsplash.c(158): warning C4189: 'verstrsize': local variable
                           is initialized but not referenced
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhstatus.c(353): warning C4057: 'function':
                           'const unsigned char *' differs in indirection
                           to slightly different base types from 'const char *'
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/mhmsg.h(70)    : warning C4200: nonstandard extension used:
                           zero-sized array in struct/union
win/win32/NetHackW.c(181): warning C4456: declaration of 'buf' hides
                           previous local declaration
win/win32/NetHackW.c(90) : note: see declaration of 'buf'
win/win32/NetHackW.c(189): warning C4456: declaration of 'buf' hides
                           previous local declaration
win/win32/NetHackW.c(90) : note: see declaration of 'buf'

win/win32/mhinput.h

@@ -10,34 +10,37 @@
 
 #define NHEVENT_CHAR 1
 #define NHEVENT_MOUSE 2
+
+union event_innards {
+    struct {
+        int ch;
+    } kbd;
+
+    struct {
+       int mod;
+       int x, y;
+    } ms;
+};
+
 typedef struct mswin_event {
     int type;
-    union {
-        struct {
-            int ch;
-        } kbd;
-
-        struct {
-            int mod;
-            int x, y;
-        } ms;
-    };
+    union event_innards ei;
 } MSNHEvent, *PMSNHEvent;
 
 #define NHEVENT_KBD(c)         \
     {                          \
         MSNHEvent e;           \
         e.type = NHEVENT_CHAR; \
-        e.kbd.ch = (c);        \
+        e.ei.kbd.ch = (c);        \
         mswin_input_push(&e);  \
     }
 #define NHEVENT_MS(_mod, _x, _y) \
     {                            \
         MSNHEvent e;             \
         e.type = NHEVENT_MOUSE;  \
-        e.ms.mod = (_mod);       \
-        e.ms.x = (_x);           \
-        e.ms.y = (_y);           \
+        e.ei.ms.mod = (_mod);       \
+        e.ei.ms.x = (_x);           \
+        e.ei.ms.y = (_y);           \
         mswin_input_push(&e);    \
     }