bugfix: remove newlines from debugger input (#1407)

The "fd" command didn't work in the debugger. This was because the "d"
was followed in the input buffer by \n rather than \0.

The Windows version of console_get replaces the terminating \r with \0.
amiberry's version uses fgets, which doesn't do this; it did adjust the
length value returned, but the debugger code doesn't look at the length.

Make it actually strip the newline characters when adjusting the length.

src/osdep/writelog.cpp

@@ -409,7 +409,11 @@ int console_get (TCHAR *out, int maxlen)
 		return -1;
 	}
 	int len = strlen(out);
-	return len - 1;
+	while (len > 0 && (out[len - 1] == '\r' || out[len - 1] == '\n')) {
+		out[len - 1] = 0;
+		len--;
+	}
+	return len;
 #endif
 }