Not really necessary to build perl, but porting/customized.t will check
the sums. Doing this defeats the purpose of customized.dat, but it's not
like there's much choice.

Separated from other patches to avoid dependence on patch ordering.

--- a/t/porting/customized.dat
+++ b/t/porting/customized.dat
@@ -1,6 +1,6 @@
 Digest cpan/Digest/Digest.pm 43f7f544cb11842b2f55c73e28930da50774e081
 Encode cpan/Encode/Unicode/Unicode.pm 9749692c67f7d69083034de9184a93f070ab4799
-ExtUtils::Constant cpan/ExtUtils-Constant/t/Constant.t a0369c919e216fb02767a637666bb4577ad79b02
+ExtUtils::Constant cpan/ExtUtils-Constant/t/Constant.t 5cddb9664c43e53a4ce7a213601d6cff53e09d2d
 File::Path cpan/File-Path/lib/File/Path.pm fd8ce4420a0c113d3f47dd3223859743655c1da8
 File::Path cpan/File-Path/t/Path_win32.t 94b9276557ce7f80b91f6fd9bfa7a0cd9bf9683e
 JSON::PP cpan/JSON-PP/bin/json_pp a7b8de6c201ef177ee82624ee4ca6a47cc1a3b4f