[pfff] remove `rm` for nonexistant files
[pfff] remove `rm` for nonexistant files

Summary:

A bunch of these don't get generated anymore, it seems, so
dropping the corresponding cleanup from the Makefile.

Test Plan:

yolo3

Reviewers: pieter

Reviewed By: pieter

CC:

Task ID: #

Blame Rev:

Hyunha/pfff,Hyunha/pfff,juergenhoetzel/pfff,egonSchiele/pfff,rpau/pfff,juergenhoetzel/pfff,juergenhoetzel/pfff,egonSchiele/pfff,Hyunha/pfff,egonSchiele/pfff,Hyunha/pfff,Hyunha/pfff,mutantzombie/pfff,egonSchiele/pfff,rpau/pfff,mutantzombie/pfff,juergenhoetzel/pfff,mutantzombie/pfff,mutantzombie/pfff,rpau/pfff,egonSchiele/pfff,Hyunha/pfff,mutantzombie/pfff,rpau/pfff,mutantzombie/pfff,juergenhoetzel/pfff,Hyunha/pfff,mutantzombie/pfff,rpau/pfff,mutantzombie/pfff,juergenhoetzel/pfff,rpau/pfff,Hyunha/pfff,rpau/pfff,egonSchiele/pfff,juergenhoetzel/pfff,mutantzombie/pfff,egonSchiele/pfff,juergenhoetzel/pfff,egonSchiele/pfff,juergenhoetzel/pfff,egonSchiele/pfff,mutantzombie/pfff,mutantzombie/pfff,rpau/pfff,Hyunha/pfff,rpau/pfff,juergenhoetzel/pfff,egonSchiele/pfff,rpau/pfff,Hyunha/pfff