treewide: format all inactive Nix files

After final improvements to the official formatter implementation,
this commit now performs the first treewide reformat of Nix files using it.
This is part of the implementation of RFC 166.

Only "inactive" files are reformatted, meaning only files that
aren't being touched by any PR with activity in the past 2 months.
This is to avoid conflicts for PRs that might soon be merged.
Later we can do a full treewide reformat to get the rest,
which should not cause as many conflicts.

A CI check has already been running for some time to ensure that new and
already-formatted files are formatted, so the files being reformatted here
should also stay formatted.

This commit was automatically created and can be verified using

    nix-build a08b3a4d19.tar.gz \
      --argstr baseRev b32a094368
    result/bin/apply-formatting $NIXPKGS_PATH

lib/systems/platforms.nix

@@ -491,12 +491,42 @@ rec {
   };
 
   # can execute on 32bit chip
-  gcc_mips32r2_o32 = { gcc = { arch = "mips32r2"; abi =  "32"; }; };
-  gcc_mips32r6_o32 = { gcc = { arch = "mips32r6"; abi =  "32"; }; };
-  gcc_mips64r2_n32 = { gcc = { arch = "mips64r2"; abi = "n32"; }; };
-  gcc_mips64r6_n32 = { gcc = { arch = "mips64r6"; abi = "n32"; }; };
-  gcc_mips64r2_64  = { gcc = { arch = "mips64r2"; abi =  "64"; }; };
-  gcc_mips64r6_64  = { gcc = { arch = "mips64r6"; abi =  "64"; }; };
+  gcc_mips32r2_o32 = {
+    gcc = {
+      arch = "mips32r2";
+      abi = "32";
+    };
+  };
+  gcc_mips32r6_o32 = {
+    gcc = {
+      arch = "mips32r6";
+      abi = "32";
+    };
+  };
+  gcc_mips64r2_n32 = {
+    gcc = {
+      arch = "mips64r2";
+      abi = "n32";
+    };
+  };
+  gcc_mips64r6_n32 = {
+    gcc = {
+      arch = "mips64r6";
+      abi = "n32";
+    };
+  };
+  gcc_mips64r2_64 = {
+    gcc = {
+      arch = "mips64r2";
+      abi = "64";
+    };
+  };
+  gcc_mips64r6_64 = {
+    gcc = {
+      arch = "mips64r6";
+      abi = "64";
+    };
+  };
 
   # based on:
   #   https://www.mail-archive.com/qemu-discuss@nongnu.org/msg05179.html
@@ -545,27 +575,38 @@ rec {
   # This function takes a minimally-valid "platform" and returns an
   # attrset containing zero or more additional attrs which should be
   # included in the platform in order to further elaborate it.
-  select = platform:
+  select =
+    platform:
     # x86
-    /**/ if platform.isx86 then pc
+    if platform.isx86 then
+      pc
 
     # ARM
-    else if platform.isAarch32 then let
-      version = platform.parsed.cpu.version or null;
-      in     if version == null then pc
-        else if lib.versionOlder version "6" then sheevaplug
-        else if lib.versionOlder version "7" then raspberrypi
-        else armv7l-hf-multiplatform
+    else if platform.isAarch32 then
+      let
+        version = platform.parsed.cpu.version or null;
+      in
+      if version == null then
+        pc
+      else if lib.versionOlder version "6" then
+        sheevaplug
+      else if lib.versionOlder version "7" then
+        raspberrypi
+      else
+        armv7l-hf-multiplatform
 
     else if platform.isAarch64 then
-      if platform.isDarwin then apple-m1
-      else aarch64-multiplatform
+      if platform.isDarwin then apple-m1 else aarch64-multiplatform
 
-    else if platform.isRiscV then riscv-multiplatform
+    else if platform.isRiscV then
+      riscv-multiplatform
 
-    else if platform.parsed.cpu == lib.systems.parse.cpuTypes.mipsel then (import ./examples.nix { inherit lib; }).mipsel-linux-gnu
+    else if platform.parsed.cpu == lib.systems.parse.cpuTypes.mipsel then
+      (import ./examples.nix { inherit lib; }).mipsel-linux-gnu
 
-    else if platform.parsed.cpu == lib.systems.parse.cpuTypes.powerpc64le then powernv
+    else if platform.parsed.cpu == lib.systems.parse.cpuTypes.powerpc64le then
+      powernv
 
-    else { };
+    else
+      { };
 }