semihosting: Split out semihost_sys_remove

Split out the non-ARM specific portions of SYS_REMOVE to a
reusable function.

Reviewed-by: Luc Michel <lmichel@kalray.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/include/semihosting/syscalls.h b/include/semihosting/syscalls.h
index 1ae5ba6..748a4b5 100644
--- a/include/semihosting/syscalls.h
+++ b/include/semihosting/syscalls.h
@@ -49,4 +49,7 @@
                        gdb_syscall_complete_cb flen_cb,
                        int fd, target_ulong fstat_addr);
 
+void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete,
+                         target_ulong fname, target_ulong fname_len);
+
 #endif /* SEMIHOSTING_SYSCALLS_H */