Fix building on perls with no . in @inc

Perl 5.26 will be able to be built with no . in @inc,
and Debian are already building their 5.24 without it.

To cope with this, do -It/lib -MFoo instead of -Mt::lib::Foo.

maint/Makefile.PL.inc/56_autogen_schema_files.pl

@@ -1,5 +1,5 @@
 my $test_ddl_fn     = 't/lib/sqlite.sql';
-my @test_ddl_cmd    = qw( -I lib -Mt::lib::ANFANG -- maint/gen_sqlite_schema_files --schema-class DBICTest::Schema );
+my @test_ddl_cmd    = qw( -I lib -I t/lib -MANFANG -- maint/gen_sqlite_schema_files --schema-class DBICTest::Schema );
 
 my $example_ddl_fn  = 'examples/Schema/db/example.sql';
 my $example_db_fn   = 'examples/Schema/db/example.db';

t/lib/ANFANG.pm

@@ -16,7 +16,7 @@ our $anfang_loaded;
 
 # this allows the obscure but possible call case to behave correctly:
 #
-#   perl -Mt::lib::ANFANG -e 'do "./t/lib/ANFANG.pm" or die ( $@ || $! )'
+#   perl -It/lib -MANFANG -e 'do "./t/lib/ANFANG.pm" or die ( $@ || $! )'
 #
 return 1 if $anfang_loaded;
 

t/lib/DBICTest/Util.pm

@@ -376,7 +376,7 @@ sub can_alloc_MB ($) {
 
   local ( $!, $^E, $?, $@ );
 
-  system( $perl, qw( -Mt::lib::ANFANG -e ), <<'EOS', $arg );
+  system( $perl, qw( -It/lib -MANFANG -e ), <<'EOS', $arg );
 $0 = 'malloc_canary';
 my $tail_character_of_reified_megastring = substr( ( join '', map chr, 0..255 ) x (4 * 1024 * $ARGV[0]), -1 );
 EOS

xt/extra/taint.t

@@ -20,7 +20,7 @@ use warnings;
 
 # there is talk of possible perl compilations where -T is fatal or just
 # doesn't work. We don't want to have the user deal with that.
-BEGIN { unless ($INC{'t/lib/DBICTest/WithTaint.pm'}) {
+BEGIN { unless ($INC{'DBICTest/WithTaint.pm'}) {
 
   if ( $^O eq 'MSWin32' and $^X =~ /\x20/ ) {
     print "1..0 # SKIP Running this test on Windows with spaces within the perl executable path (\$^X) is not possible due to https://rt.perl.org/Ticket/Display.html?id=123907\n";
@@ -56,7 +56,7 @@ BEGIN { unless ($INC{'t/lib/DBICTest/WithTaint.pm'}) {
     exit 0;
   }
 
-  exec( $perl, qw( -I. -Mt::lib::DBICTest::WithTaint -T ), __FILE__ );
+  exec( $perl, qw( -It/lib -MDBICTest::WithTaint -T ), __FILE__ );
 }}
 
 # We need to specify 'lib' here as well because even if it was already in