migrate: apply remaining patches to source forks, clean up

Apply all active patches from archived patches to source forks:
- kernel: 33 individual patches + consolidated mega-patch (34 total commits)
- relibc: 33 individual patches (34 total commits)
- base: 26 individual patches + redox.patch mega-patch (28 total commits)
- bootloader: 4 patches (5 total commits)
- installer: 1 patch (2 total commits)
- redoxfs: 2 patches (3 total commits)
- userutils: 2 patches (3 total commits)

Cleanup:
- Remove all .rej and .orig files from fork repos
- Delete all absorbed/ subdirectories (71 already-folded patches)
- Delete stale .patch files from recipe directories (~130 upstream port patches)
- 282 remaining .patch files are for non-fork components (archived, not in build system)

recipes/dev/rustpython/redox.patch

@@ -1,22 +0,0 @@
-diff --git a/stdlib/src/posixsubprocess.rs b/stdlib/src/posixsubprocess.rs
-index 7f418c899..4da6a6858 100644
---- a/stdlib/src/posixsubprocess.rs
-+++ b/stdlib/src/posixsubprocess.rs
-@@ -441,15 +441,14 @@ fn close_dir_fds(keep: KeepFds<'_>) -> nix::Result<()> {
- fn close_filetable_fds(keep: KeepFds<'_>) -> nix::Result<()> {
-     use nix::fcntl;
-     use std::os::fd::{FromRawFd, OwnedFd};
--    let fd = fcntl::open(
-+    let filetable = fcntl::open(
-         c"/scheme/thisproc/current/filetable",
-         fcntl::OFlag::O_RDONLY,
-         nix::sys::stat::Mode::empty(),
-     )?;
--    let filetable = unsafe { OwnedFd::from_raw_fd(fd) };
-     let read_one = || -> nix::Result<_> {
-         let mut byte = 0;
--        let n = nix::unistd::read(filetable.as_raw_fd(), std::slice::from_mut(&mut byte))?;
-+        let n = nix::unistd::read(&filetable, std::slice::from_mut(&mut byte))?;
-         Ok((n > 0).then_some(byte))
-     };
-     while let Some(c) = read_one()? {