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 */