message: Update submodule URLs to point to the RWTH-OS ones.
diff: [submodule "lwip"]
  path = lwip
  - url = https://github.com/ColinFinck/LwIP.git
  + url = https://github.com/RWTH-OS/LwIP.git
  branch = path2rs
  [submodule "usr/libomp"]
  path = usr/libomp
  - url = https://github.com/ColinFinck/libomp_oss.git
  + url = https://github.com/RWTH-OS/libomp_oss.git
  branch = path2rs
  [submodule "crates/x86"]
  path = crates/x86
  branch = all-merged
  [submodule "crates/raw_cpuid"]
  path = crates/raw_cpuid
  - url = https://github.com/ColinFinck/rust-cpuid.git
  + url = https://github.com/RWTH-OS/rust-cpuid.git
  branch = extended-brand-string-fix
  [submodule "crates/rlibc"]
  path = crates/rlibc
  