allow gcc build to succeed with -DWIN31SUPPORT

hdr/win.h

@@ -18,6 +18,12 @@ struct WinStartupInfo
   ULONG optInstanceTable; /* used only if winver set to 0x400 (w95)*/
 };
 extern struct WinStartupInfo winStartupInfo;
+#if defined __GNUC__
+extern UWORD winseg1, winseg2, winseg3;
+extern UBYTE markEndInstanceData;
+extern struct lol ASM FAR DATASTART;
+#endif
+
 
 /* contains a list of offsets relative to DOS data segment of
    various internal variables.

kernel/inthndlr.c

@@ -2001,6 +2001,11 @@ VOID ASMCFUNC int2F_12_handler(struct int2f12regs FAR *pr)
         r.es = FP_SEG(&winStartupInfo);
         r.BX = FP_OFF(&winStartupInfo);
         winStartupInfo.winver = r.di;  /* match what caller says it is */
+#if defined __GNUC__
+	winseg1 = FP_SEG(&winStartupInfo);
+	winseg2 = FP_SEG(&DATASTART);
+	winseg3 = FP_OFF(&markEndInstanceData);
+#endif
         winInstanced = 1; /* internal flag marking Windows is active */
         DebugPrintf(("Win startup\n"));
         break;

kernel/kernel.asm

@@ -621,11 +621,25 @@ _winStartupInfo:
                 dd 0 ; next startup info structure, 0:0h marks end
                 dd 0 ; far pointer to name virtual device file or 0:0h
                 dd 0 ; far pointer, reference data for virtual device driver
+ %ifnidni __OUTPUT_FORMAT__, elf
                 dw instance_table,seg instance_table ; array of instance data
+ %else
+                dw instance_table ; array of instance data
+global _winseg1
+_winseg1:	dw 0
+ %endif
 instance_table: ; should include stacks, Win may auto determine SDA region
                 ; we simply include whole DOS data segment
+ %ifnidni __OUTPUT_FORMAT__, elf
                 dw seg _DATASTART, 0 ; [SEG:OFF] address of region's base
-                dw markEndInstanceData wrt seg _DATASTART ; size in bytes
+                dw _markEndInstanceData wrt seg _DATASTART ; size in bytes
+ %else
+global _winseg2
+_winseg2:	dw 0
+                dw 0 ; [SEG:OFF] address of region's base
+global _winseg3
+_winseg3:	dw 0 ; size in bytes
+ %endif
                 dd 0 ; 0 marks end of table
                 dw 0 ; and 0 length for end of instance_table entry
                 global  _winPatchTable
@@ -989,7 +1003,8 @@ segment DYN_DATA
 _Dyn:
         DynAllocated dw 0
 
-markEndInstanceData:  ; mark end of DOS data seg we say needs instancing
+global _markEndInstanceData
+_markEndInstanceData:  ; mark end of DOS data seg we say needs instancing
 
         
 segment ID_B