Motivation for this change

This fixes a regression introduced by #94049.

builder for '/nix/store/86lrf5m4vy9r4hbwm6r95ljv6w0pwi4d-libplacebo-2.72.0.drv' failed with exit code 1; last 10 log lines:
  build flags: -j128 -l128
  [42/44] Compiling C++ object 'src/25a6634@@placebo@sha/glsl_glslang.cc.o's_gen.c.o'
  FAILED: src/25a6634@@placebo@sha/glsl_glslang.cc.o
  g++ -Isrc/25a6634@@placebo@sha -Isrc -I../src -I../src/include -I../src/include/dummy -I../subprojects/xtalloc/include -I../subprojects/bstr/include -I/nix/store/81iy20n5rhvcm18ha289anygpgq5qyjc-lcms2-2.11-dev/include -I/nix/store/riw48ysh0rhkf2fck7m1iiany4rif2mv-vulkan-headers-1.2.141.0/include -I/nix/store/psda85jw38cxzqp6fa59vrdipz67h6bk-epoxy-1.5.4-dev/include -I/usr/include/glslang -I/nix/store/my4bdsgi308bq216gkhfwnwnk35yhszn-libplacebo-2.72.0/include/glslang -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -std=c++11 -Wundef -Wshadow -Wparentheses -Wpointer-arith -fvisibility=hidden -fPIC -pthread -MD -MQ 'src/25a6634@@placebo@sha/glsl_glslang.cc.o' -MF 'src/25a6634@@placebo@sha/glsl_glslang.cc.o.d' -o 'src/25a6634@@placebo@sha/glsl_glslang.cc.o' -c ../src/glsl/glslang.cc
  ../src/glsl/glslang.cc:229:1: error: cannot convert '<brace-enclosed initializer list>' to 'int' in initialization
    229 | };
        | ^

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.