perlPackages.Po4a: disable tests on musl

Void linux package have investigated the failure and tracked it down to differences in gettext behavior. They decided to disable tests.
https://github.com/void-linux/void-packages/pull/34029#issuecomment-973267880
Alpine packagers have not worried about running the tests until now:
https://git.alpinelinux.org/aports/tree/main/po4a/APKBUILD#n11

Yureka fec315a1 b8a99260

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pkgs/development/perl-modules/Po4a/default.nix
··· 19 export PERL_MB_OPT="--install_base=$out --prefix=$out" 20 ''; 21 buildPhase = "perl Build.PL --install_base=$out --install_path=\"lib=$out/${perl.libPrefix}\"; ./Build build"; 22 checkPhase = '' 23 export SGML_CATALOG_FILES=${docbook_sgml_dtd_41}/sgml/dtd/docbook-4.1/docbook.cat 24 ./Build test
··· 19 export PERL_MB_OPT="--install_base=$out --prefix=$out" 20 ''; 21 buildPhase = "perl Build.PL --install_base=$out --install_path=\"lib=$out/${perl.libPrefix}\"; ./Build build"; 22 + 23 + # Disabling tests on musl 24 + # Void linux package have investigated the failure and tracked it down to differences in gettext behavior. They decided to disable tests. 25 + # https://github.com/void-linux/void-packages/pull/34029#issuecomment-973267880 26 + # Alpine packagers have not worried about running the tests until now: 27 + # https://git.alpinelinux.org/aports/tree/main/po4a/APKBUILD#n11 28 + doCheck = !stdenv.hostPlatform.isMusl; 29 + 30 checkPhase = '' 31 export SGML_CATALOG_FILES=${docbook_sgml_dtd_41}/sgml/dtd/docbook-4.1/docbook.cat 32 ./Build test