linuxPackages.*: Drop unneeded NIX_CFLAGS_COMPILE usage (#484933)

pkgs/os-specific/linux/digimend/default.nix

@@ -22,9 +22,6 @@ stdenv.mkDerivation {
     sed 's/depmod /true /' -i Makefile
   '';
 
-  # Fix build on Linux kernel >= 5.18
-  env.NIX_CFLAGS_COMPILE = toString [ "-Wno-error=implicit-fallthrough" ];
-
   nativeBuildInputs = kernel.moduleBuildDependencies;
 
   makeFlags = kernelModuleMakeFlags ++ [

pkgs/os-specific/linux/lttng-modules/default.nix

@@ -21,8 +21,6 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "pic" ];
 
-  env.NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
-
   makeFlags = kernelModuleMakeFlags ++ [
     "KERNELDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
     "INSTALL_MOD_PATH=${placeholder "out"}"

pkgs/os-specific/linux/nvidia-x11/open.nix

@@ -10,55 +10,50 @@
   broken ? false,
 }:
 
-stdenv.mkDerivation (
-  {
-    pname = "nvidia-open";
-    version = "${kernel.version}-${nvidia_x11.version}";
+stdenv.mkDerivation {
+  pname = "nvidia-open";
+  version = "${kernel.version}-${nvidia_x11.version}";
 
-    src = fetchFromGitHub {
-      owner = "NVIDIA";
-      repo = "open-gpu-kernel-modules";
-      rev = nvidia_x11.version;
-      inherit hash;
-    };
+  src = fetchFromGitHub {
+    owner = "NVIDIA";
+    repo = "open-gpu-kernel-modules";
+    rev = nvidia_x11.version;
+    inherit hash;
+  };
 
-    inherit patches;
+  inherit patches;
 
-    nativeBuildInputs = kernel.moduleBuildDependencies;
+  nativeBuildInputs = kernel.moduleBuildDependencies;
 
-    makeFlags =
-      kernelModuleMakeFlags
-      ++ [
-        "IGNORE_PREEMPT_RT_PRESENCE=1"
-        "SYSSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/source"
-        "SYSOUT=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
-        "MODLIB=$(out)/lib/modules/${kernel.modDirVersion}"
-        "DATE="
-        "TARGET_ARCH=${stdenv.hostPlatform.parsed.cpu.name}"
-      ]
-      ++ lib.optionals stdenv.cc.isClang [
-        "C_INCLUDE_PATH=${lib.getLib stdenv.cc.cc}/lib/clang/${lib.versions.major stdenv.cc.cc.version}/include"
-      ];
+  makeFlags =
+    kernelModuleMakeFlags
+    ++ [
+      "IGNORE_PREEMPT_RT_PRESENCE=1"
+      "SYSSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/source"
+      "SYSOUT=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+      "MODLIB=$(out)/lib/modules/${kernel.modDirVersion}"
+      "DATE="
+      "TARGET_ARCH=${stdenv.hostPlatform.parsed.cpu.name}"
+    ]
+    ++ lib.optionals stdenv.cc.isClang [
+      "C_INCLUDE_PATH=${lib.getLib stdenv.cc.cc}/lib/clang/${lib.versions.major stdenv.cc.cc.version}/include"
+    ];
 
-    installTargets = [ "modules_install" ];
-    enableParallelBuilding = true;
+  installTargets = [ "modules_install" ];
+  enableParallelBuilding = true;
 
-    meta = {
-      description = "NVIDIA Linux Open GPU Kernel Module";
-      homepage = "https://github.com/NVIDIA/open-gpu-kernel-modules";
-      license = with lib.licenses; [
-        gpl2Plus
-        mit
-      ];
-      platforms = [
-        "x86_64-linux"
-        "aarch64-linux"
-      ];
-      maintainers = with lib.maintainers; [ nickcao ];
-      inherit broken;
-    };
-  }
-  // lib.optionalAttrs stdenv.hostPlatform.isAarch64 {
-    env.NIX_CFLAGS_COMPILE = "-fno-stack-protector";
-  }
-)
+  meta = {
+    description = "NVIDIA Linux Open GPU Kernel Module";
+    homepage = "https://github.com/NVIDIA/open-gpu-kernel-modules";
+    license = with lib.licenses; [
+      gpl2Plus
+      mit
+    ];
+    platforms = [
+      "x86_64-linux"
+      "aarch64-linux"
+    ];
+    maintainers = with lib.maintainers; [ nickcao ];
+    inherit broken;
+  };
+}

pkgs/os-specific/linux/rtl8814au/default.nix

@@ -22,8 +22,6 @@ stdenv.mkDerivation {
 
   hardeningDisable = [ "pic" ];
 
-  env.NIX_CFLAGS_COMPILE = "-Wno-error=incompatible-pointer-types";
-
   prePatch = ''
     substituteInPlace ./Makefile \
       --replace /lib/modules/ "${kernel.dev}/lib/modules/" \