pommed_light: pull fix pending upstream inclusion for -fno-common toolchains
pommed_light: pull fix pending upstream inclusion for -fno-common toolchains

Without the change builds fails on upstream gcc-10 as:

    ld: mactel/nv8600mgt_backlight.o:/build/pommed-light/pommed/mactel/nv8600mgt_backlight.c:50: multiple definition of
      `lcd_bck_info'; sysfs_backlight.o:/build/pommed-light/pommed/sysfs_backlight.c:124: first defined here

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs