moves semihosting away from libwrap

include/semihosting.h

@@ -0,0 +1,31 @@
+#ifndef SEMIHOSTING_H
+#define SEMIHOSTING_H
+
+#include <sys/types.h>
+#include <unistd.h>
+// int32_t trace_write(const char* buf, uint32_t nbyte);
+
+void sh_seek(int, off_t);
+void sh_write0(const char *buf);
+void sh_writec(char c);
+char sh_readc(void);
+int sh_clock(void);
+int sh_read(char *, int, size_t);
+void sh_write(char *, int);
+int sh_open(char *, int);
+void sh_rename(char *, char *);
+int sh_remove(char *);
+int sh_istty(int);
+int sh_iserror(int);
+int sh_flen(int);
+void sh_exit(void);
+void sh_exit_extended(void);
+int sh_close(int);
+int sh_time(void);
+int sh_errno(void);
+
+int getchar(void);
+
+extern int sh_missing_host;
+
+#endif