Adapt to Perl 5.26
Adapt to Perl 5.26

Perl 5.26.0 removed "." from @INC, thus
t/RPM/Grill/RPM/Files/20eu-readelf.t test fails becaue it cannot load
"expect" files via "do".

This patch fixes this test. There are maybe other places to fix.

default-to-open/rpmgrill,default-to-open/rpmgrill