linuxHeaders: 4.19.16 -> 5.5

Linux has reworked its header install process in
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=59b2bd05f5f4dc62979c2e82ddd384f07e8f10bc
It has introduced `make headers` that prepares the headers in ./usr/include, and
made `make headers_install` copy the headers from there using rsync.

pkgs/os-specific/linux/kernel-headers/default.nix

@@ -1,5 +1,5 @@
 { stdenvNoCC, lib, buildPackages
-, fetchurl, perl
+, fetchurl, perl, rsync
 , elf-header
 }:
 
@@ -16,7 +16,7 @@ let
     # We do this so we have a build->build, not build->host, C compiler.
     depsBuildBuild = [ buildPackages.stdenv.cc ];
     # `elf-header` is null when libc provides `elf.h`.
-    nativeBuildInputs = [ perl elf-header ];
+    nativeBuildInputs = [ perl rsync elf-header ];
 
     extraIncludeDirs = lib.optional stdenvNoCC.hostPlatform.isPowerPC ["ppc"];
 
@@ -39,12 +39,8 @@ let
     # Skip clean on darwin, case-sensitivity issues.
     buildPhase = lib.optionalString (!stdenvNoCC.buildPlatform.isDarwin) ''
       make mrproper $makeFlags
-    ''
-    # For some reason, doing `make install_headers` twice, first without
-    # INSTALL_HDR_PATH=$out then with, is neccessary to get this to work
-    # for darwin cross. @Ericson2314 has no idea why.
-    + ''
-      make headers_install $makeFlags
+    '' + ''
+      make headers $makeFlags
     '';
 
     checkPhase = ''
@@ -55,13 +51,9 @@ let
       make headers_install INSTALL_HDR_PATH=$out $makeFlags
     ''
     # Some builds (e.g. KVM) want a kernel.release.
-    + '' mkdir -p $out/include/config
-      echo "${version}-default" > $out/include/config/kernel.release
-    ''
-    # These oddly named file records the `SHELL` passed, which causes bootstrap
-    # tools run-time dependency.
     + ''
-      find "$out" -name '..install.cmd' -print0 | xargs -0 rm
+      mkdir -p $out/include/config
+      echo "${version}-default" > $out/include/config/kernel.release
     '';
 
     meta = with lib; {
@@ -73,16 +65,15 @@ let
 in {
   inherit makeLinuxHeaders;
 
-  linuxHeaders = let version = "4.19.16"; in
+  linuxHeaders = let version = "5.5"; in
     makeLinuxHeaders {
       inherit version;
       src = fetchurl {
-        url = "mirror://kernel/linux/kernel/v4.x/linux-${version}.tar.xz";
-        sha256 = "1pqvn6dsh0xhdpawz4ag27vkw1abvb6sn3869i4fbrz33ww8i86q";
+        url = "mirror://kernel/linux/kernel/v5.x/linux-${version}.tar.xz";
+        sha256 = "0c131fi6s7vgvka1c0597vnvcmwn1pp968rci5kq64iwj3pd9yx6";
       };
       patches = [
          ./no-relocs.patch # for building x86 kernel headers on non-ELF platforms
-         ./no-dynamic-cc-version-check.patch # so we can use `stdenvNoCC`, see `makeFlags` above
       ];
     };
 }