Fix issue #4046 Seg fault in config_files() - #4052

It looks like the Travis CI Build Job #9100.3 failed with a segmentation fault in libgit2_clar. I enclose the relevant lines from the log.

1: threads::basic....
1: threads::diff..
1/4 Test #1: libgit2_clar .............................***Exception: SegFault 37.42 sec
test 2

My commit changed only one file -- examples/generate.c, and I'm fairly sure that libgit2_clar doesn't run the examples/generate executable. I also noticed that other Trravis CI Build Jobs for this Pull Request were successful, e.g. #9100.2, where this area of its log looks like

1: threads::basic...S
1: threads::diff..
1: threads::iterator.
1: threads::refdb.
1: trace::traceSSSSSS
1: trace::windows::stacktrace...
1: transport::register....
1: win32::forbidden..........
1: win32::longpath.
1:
1/4 Test #1: libgit2_clar ............................. Passed 41.60 sec
test 2

I noticed that Pull Request #4051, which was submitted about an hour before mine, has an identical failure for Build Job #9099.8.

Could this segmentation fault be an intermittent bug? Is there perhaps a way to bypass this test so Pull Requests can be processes?

Thanks! 😀