Fix mode consts.

Use modern consts present on modern Android.

--- src-orig/arjsfxjr.c	2017-09-08 21:45:38.418802563 +0200
+++ src/arjsfxjr.c	2017-09-08 22:12:14.130184907 +0200
@@ -520,7 +520,7 @@
    }
   }
   create_subdir_tree(filename);
-  if(file_type!=ARJT_DIR&&(atstream=open(filename, O_CREAT|O_TRUNC|O_BINARY|O_RDWR, S_IREAD|S_IWRITE))<0)
+  if(file_type!=ARJT_DIR&&(atstream=open(filename, O_CREAT|O_TRUNC|O_BINARY|O_RDWR, S_IRUSR|S_IWUSR))<0)
   {
    skip_file(M_CANTOPEN_F);
    errors++;