Add -f to some more rm commands which should never fail.
Add -f to some more rm commands which should never fail.

The clean target can be run even if the relevant files have not been
created, so the rm shouldn't fail.

tst2005/luarocks,starius/luarocks,xpol/luainstaller,ignacio/luarocks,tst2005/luarocks,robooo/luarocks,xiaq/luarocks,lxbgit/luarocks,xpol/luavm,robooo/luarocks,luarocks/luarocks,keplerproject/luarocks,ignacio/luarocks,rrthomas/luarocks,lxbgit/luarocks,robooo/luarocks,ignacio/luarocks,luarocks/luarocks,keplerproject/luarocks,aryajur/luarocks,usstwxy/luarocks,xiaq/luarocks,lxbgit/luarocks,starius/luarocks,rrthomas/luarocks,coderstudy/luarocks,xpol/luavm,xpol/luavm,xpol/luainstaller,usstwxy/luarocks,keplerproject/luarocks,xiaq/luarocks,xpol/luarocks,keplerproject/luarocks,ignacio/luarocks,tarantool/luarocks,leafo/luarocks,starius/luarocks,aryajur/luarocks,rrthomas/luarocks,usstwxy/luarocks,starius/luarocks,tst2005/luarocks,leafo/luarocks,aryajur/luarocks,aryajur/luarocks,xpol/luarocks,xpol/luarocks,xpol/luavm,leafo/luarocks,lxbgit/luarocks,usstwxy/luarocks,xpol/luarocks,coderstudy/luarocks,xpol/luainstaller,tst2005/luarocks,luarocks/luarocks,xiaq/luarocks,coderstudy/luarocks,tarantool/luarocks,xpol/luainstaller,rrthomas/luarocks,coderstudy/luarocks,xpol/luavm,robooo/luarocks,tarantool/luarocks