poppler: format, add dependency for glib-mkenums to fix cross building

[jwillikers]

Cross-building poppler is broken:

nix build .#pkgsCross.aarch64-multiplatform.poppler
error: builder for '/nix/store/xkgfqac2i1wz692ijvhqrb06gd2y2hba-poppler-glib-aarch64-unknown-linux-gnu-24.02.0.drv' failed with exit code 1;
       last 25 log lines:
       > [136/184] Building CXX object cpp/CMakeFiles/poppler-cpp.dir/poppler-document.cpp.o
       > [137/184] Building CXX object cpp/CMakeFiles/poppler-cpp.dir/poppler-toc.cpp.o
       > [138/184] Building CXX object test/CMakeFiles/cairo-thread-test.dir/__/poppler/CairoRescaleBox.cc.o
       > [139/184] Building CXX object test/CMakeFiles/pdf-fullrewrite.dir/__/utils/parseargs.cc.o
       > [140/184] Building CXX object cpp/CMakeFiles/poppler-cpp.dir/poppler-page.cpp.o
       > [141/184] Building CXX object CMakeFiles/poppler.dir/poppler/PSOutputDev.cc.o
       > [142/184] Building CXX object test/CMakeFiles/image-embedding.dir/__/utils/parseargs.cc.o
       > [143/184] Building CXX object cpp/tests/CMakeFiles/poppler-dump.dir/__/__/utils/parseargs.cc.o
       > [144/184] Linking CXX shared library libpoppler.so.134.0.0
       > [145/184] Creating library symlink libpoppler.so.134 libpoppler.so
       > [146/184] Generating poppler-enums.h
       > FAILED: glib/poppler-enums.h /build/poppler-24.02.0/build/glib/poppler-enums.h
       > cd /build/poppler-24.02.0/glib && /nix/store/px2nj16i5gc3d4mnw5l1nclfdxhry61p-python3-3.12.7/bin/python3 GLIB2_MKENUMS-NOTFOUND --template poppler-enums.h.template poppler-action.h poppler-date.h poppler-document.h poppler-page.h poppler-attachment.h poppler-form-field.h poppler-annot.h poppler-layer.h poppler-movie.h poppler-media.h poppler.h poppler-structure-element.h > /build/poppler-24.02.0/build/glib/poppler-enums.h
       > /nix/store/px2nj16i5gc3d4mnw5l1nclfdxhry61p-python3-3.12.7/bin/python3: can't open file '/build/poppler-24.02.0/glib/GLIB2_MKENUMS-NOTFOUND': [Errno 2] No such file or directory
       > [147/184] Building CXX object test/CMakeFiles/perf-test.dir/perf-test.cc.o
       > [148/184] Linking CXX shared library cpp/libpoppler-cpp.so.0.11.0
       > [149/184] Building CXX object cpp/tests/CMakeFiles/poppler-render.dir/__/__/utils/parseargs.cc.o
       > [150/184] Building CXX object test/CMakeFiles/image-embedding.dir/image-embedding.cc.o
       > [151/184] Building CXX object cpp/tests/CMakeFiles/poppler-render.dir/poppler-render.cpp.o
       > [152/184] Building CXX object test/CMakeFiles/pdf-fullrewrite.dir/pdf-fullrewrite.cc.o
       > [153/184] Building CXX object cpp/tests/CMakeFiles/poppler-dump.dir/poppler-dump.cpp.o
       > [154/184] Building CXX object test/CMakeFiles/cairo-thread-test.dir/__/poppler/CairoFontEngine.cc.o
       > [155/184] Building CXX object test/CMakeFiles/cairo-thread-test.dir/cairo-thread-test.cc.o
       > [156/184] Building CXX object test/CMakeFiles/cairo-thread-test.dir/__/poppler/CairoOutputDev.cc.o
       > ninja: build stopped: subcommand failed.
       For full logs, run 'nix log /nix/store/xkgfqac2i1wz692ijvhqrb06gd2y2hba-poppler-glib-aarch64-unknown-linux-gnu-24.02.0.drv'.

This PR adds the missing dependency on glib-mkenums.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[uninsane]

oh, rebuild count is 501-1000: it might be good to target this against staging