[Ohrrpgce] SVN: teeemcee/11526 Remove or replace a few isfile's which were slowing things down somewhat

[subversion at HamsterRepublic.com]

teeemcee
2019-12-30 21:59:05 -0800 (Mon, 30 Dec 2019)
158
Remove or replace a few isfile's which were slowing things down somewhat

real_isfile, which doesn't test whether it's readable, is good enough nearly
always.
---
U   wip/common.rbas
U   wip/loading.rbas