- Avoid using += in Makefile when bootstrapping for portability (RT#100797)
- adjust quoting of paths with spaces to work with ExtUtils::MakeMaker 7.0,
and bump our EUMM prereq to 7.0.
- fix shell test for shells where we can't prevent some rc files from being
loaded, like zsh (RT#99819).
OBS-URL: https://build.opensuse.org/package/show/devel:languages:perl/perl-local-lib?expand=0&rev=31