So this was suggested as [long ago as October, 2015](https://github.com/NixOS/nixpkgs/issues/10376#issuecomment-147734898).
Despite being fairly ignorant of the nix Python support, I decided
that I really wanted this; this change brings in what I believe are
the necessary components---I have, at least, successfully run `beet
replaygain` and `beet bpd`---but it may not do it in the best way; I'm
happy to consider input on that front.
I can at least state that all three changes are necessary---leave any
one of them out and gstreamer support doesn't work.
Fixes this:
$ gscriptor
Can't load '/nix/store/17w6hdwbli924v7d43xxxp66qhgqpc24-perl-Pango-1.227/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi/auto/Pango/Pango.so' for module Pango: /nix/store/17w6hdwbli924v7d43xxxp66qhgqpc24-perl-Pango-1.227/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi/auto/Pango/Pango.so: undefined symbol: cairo_font_type_to_sv at /nix/store/5z1wn7knhckr3a0asb8lzp99sdai09f2-perl-5.22.2/lib/perl5/5.22.2/x86_64-linux-thread-multi/DynaLoader.pm line 193.
at /nix/store/srdac7af3nz6fb74haa8l8ls9wd9pas0-perl-Gtk2-1.2498/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi/Gtk2.pm line 31.
Compilation failed in require at /nix/store/srdac7af3nz6fb74haa8l8ls9wd9pas0-perl-Gtk2-1.2498/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi/Gtk2.pm line 31.
BEGIN failed--compilation aborted at /nix/store/srdac7af3nz6fb74haa8l8ls9wd9pas0-perl-Gtk2-1.2498/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi/Gtk2.pm line 31.
Compilation failed in require at /nix/store/sgy2xsyvmam09pl25x8gb507gyiz9ybn-pcsc-tools-1.4.25/bin/.gscriptor-wrapped line 28.
BEGIN failed--compilation aborted at /nix/store/sgy2xsyvmam09pl25x8gb507gyiz9ybn-pcsc-tools-1.4.25/bin/.gscriptor-wrapped line 28.
Using the upstream patch directly. It's copied in nixpkgs, because:
- fetchpatch isn't usable at this point in bootstrapping,
- the upstream patch creates collisions in NEWS.
This reverts commit 1daf2e26d2, reversing
changes made to c0c50dfcb7.
It seems this is what has been causing all the reliability problems
on Hydra. I'm currently unable to find why it happens, so I'm forced
to revert the update for now. Discussion: #22874.