Minor packaging guidelines fixes

- Add buildrequires for perl-interpreter
- Prefer modern optflags and buildroot macros
- Use standard perl file/directory ownership patterns

https://docs.fedoraproject.org/en-US/packaging-guidelines/Perl/#_build_dependencies
https://docs.fedoraproject.org/en-US/packaging-guidelines/#_using_buildroot_and_optflags_vs_rpm_build_root_and_rpm_opt_flags
https://docs.fedoraproject.org/en-US/packaging-guidelines/Perl/#_directory_ownership

perl-EV.spec

@@ -12,10 +12,11 @@ Source0:        https://cpan.metacpan.org/authors/id/M/ML/MLEHMANN/EV-%{version}
 Patch0:         perl-EV-4.03-Don-t-ask-questions-at-build-time.patch
 Patch1:         perl-EV-4.30-Don-t-check-bundled-libev.patch
 
-BuildRequires: make
+BuildRequires:  make
 BuildRequires:  gcc
 BuildRequires:  perl-devel
 BuildRequires:  perl-generators
+BuildRequires:  perl-interpreter
 BuildRequires:  perl(ExtUtils::MakeMaker) >= 6.76
 BuildRequires:  perl(common::sense)
 BuildRequires:  gdbm-devel
@@ -52,25 +53,24 @@ cp -r /usr/share/libev-source/* ./libev/
 
 
 %build
-PERL_CANARY_STABILITY_NOPROMPT=1 /usr/bin/perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="$RPM_OPT_FLAGS" NO_PACKLIST=1 NO_PERLLOCAL=1
-%{make_build}
+PERL_CANARY_STABILITY_NOPROMPT=1 perl Makefile.PL INSTALLDIRS=vendor OPTIMIZE="%{optflags}" NO_PACKLIST=1 NO_PERLLOCAL=1
+%make_build
 
 
 %install
-%{make_install}
-%{_fixperms} $RPM_BUILD_ROOT/*
+%make_install
+%{_fixperms} %{buildroot}/*
 
 
 %check
-%{make_build} test
+%make_build test
 
 
 %files
 %doc Changes COPYING README
-%{perl_vendorarch}/auto/*
-%{perl_vendorarch}/EV.pm
-%{perl_vendorarch}/EV
-%{_mandir}/man3/*.3*
+%{perl_vendorarch}/*
+%exclude %dir %{perl_vendorarch}/auto/
+%{_mandir}/man3/EV*.3pm*
 
 
 %changelog