* nongnu/packages/linux.scm (broadcom-sta): New variable.
* nongnu/packages/patches/broadcom-sta-debian-fix-kernel-warnings.patch: New file.
* nongnu/packages/patches/broadcom-sta-fix_mac_profile_discrepancy.patch: New file.
* nongnu/packages/patches/broadcom-sta-gcc.patch: New file.
* nongnu/packages/patches/broadcom-sta-license.patch: New file.
* nongnu/packages/patches/broadcom-sta-linux-4.11.patch: New file.
* nongnu/packages/patches/broadcom-sta-linux-4.12.patch: New file.
* nongnu/packages/patches/broadcom-sta-linux-4.15.patch: New file.
* nongnu/packages/patches/broadcom-sta-linux-4.7.patch: New file.
* nongnu/packages/patches/broadcom-sta-linux-4.8.patch: New file.
* nongnu/packages/patches/broadcom-sta-linux-5.1.patch: New file.
* nongnu/packages/patches/broadcom-sta-null-pointer-fix.patch: New file.
* nongnu/packages/patches/broadcom-sta-rdtscl.patch: New file.
* nongnu/packages/linux.scm: Replace probably-redundant copyright attributions
with Pierre Neidhardt instead.
(linux-firmware): Use his build system instead of the one from Andy Wingo's
guix-nonfree repository.