try to reduce some Amiga cross-compile warnings

include/amiconf.h

@@ -17,6 +17,10 @@
 #ifdef CROSS_TO_AMIGA
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
+#include <dos/dos.h>
+#include <clib/dos_protos.h>
+#include <proto/dos.h>
 #endif
 
 #ifdef __SASC_60    /* since SAS can prevent re-inclusion */

include/global.h

@@ -110,10 +110,14 @@ enum optchoice { opt_in, opt_out};
 typedef uchar nhsym;
 
 #ifndef STRNCMPI
-#ifndef __SASC_60 /* SAS/C already shifts to stricmp */
+/* SAS/C already shifts to stricmp */
+#if !defined(__SASC_60) && !defined(CROSS_TO_AMIGA)
 #define strcmpi(a, b) strncmpi((a), (b), -1)
 #endif
 #endif
+#ifdef CROSS_TO_AMIGA
+#define strcmpi(a, b) stricmp(a, b)
+#endif
 
 /* #define SPECIALIZATION */ /* do "specialized" version of new topology */
 

sys/amiga/amidos.c

@@ -450,7 +450,11 @@ fopenp(const char *name, const char *mode)
 static BPTR OrgDirLock = NO_LOCK;
 
 int
-chdir(char *dir)
+chdir(
+#ifdef CROSS_TO_AMIGA
+      const
+#endif
+      char *dir)
 {
     extern char orgdir[];
 

sys/amiga/amidos.p

@@ -31,10 +31,10 @@ void getreturn(const char *);
 #ifndef msmsg
 void msmsg( const char *, ... );
 #endif
-#if !defined(__SASC_60) && !defined(_DCC)
+#if !defined(__SASC_60) && !defined(_DCC) && !defined(CROSS_TO_AMIGA)
 int chdir(char *);
 #endif
-#ifndef	strcmpi
+#ifndef        strcmpi
 int strcmpi(char * , char *);
 #endif
 #if !defined(memcmp) && !defined(AZTEC_C) && !defined(_DCC) && !defined(__GNUC__)

sys/amiga/amiwind.c

@@ -891,6 +891,10 @@ amii_loadlib(void)
 {
 }
 
+#ifdef CROSS_TO_AMIGA
+extern void Abort(long) NORETURN;
+#endif
+
 /* fatal error */
 /*VARARGS1*/
 void error