[PATCH] Makefile.PL: drop generated lib/PublicInbox.pm in blib/

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Running "make test" on this project doesn't pass unless you've got an
existing PublicInbox.pm in your @INC, presumably nobody's set this up
on a fresh machine in a while.

This Makefile.PL trickery seems to do it, I've validated this with
this ad-hoc test of committing blib/ and Makefile to the repository:

    git clean -dxf; perl Makefile.PL && make -j8 all && git add -f blib Makefile.PL Makefile && git commit -m"now"

Running that in interactive rebase before/after shows that only the
PublicInbox.pm file was added to blib/lib/. We use $(INST_LIB) instead
of a hardcoded 'blib/lib' now, but it's what ExtUtils::MakeMaker
recommends, so it's probably for the better.

As far as I can tell this broke with 1fae720d (build: generate
PublicInbox.pm with $VERSION, 2021-04-01), but I have not tested
that. See also 1fae720d (build: generate PublicInbox.pm with $VERSION,
2021-04-01) which made the PublicInbox.pm a generated file.
---
 Makefile.PL | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Makefile.PL b/Makefile.PL
index 348a343d..b3ac59be 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -190,6 +190,16 @@ WriteMakefile(
 		FILES => 't/home*/setup* t/home*/t* t/home*/.public-inbox '.
 			't/data-gen/*'
 	},
+	PM => {
+		map {
+			s[^lib/][]s;
+			+('lib/' . $_ => '$(INST_LIB)/' . $_);
+		} grep {
+			# Will include *.pod and an *.h file, but so
+			# would ExtUtils::MakeMaker.
+			m[^lib/];
+		} @manifest
+	},
 );
 
 sub MY::postamble {
-- 
2.33.1.1338.g20da966911a