packages.perlNetInterface: patch grepping for library headers

The make file has a check to grep for the AF_INET symbol in
/usr/include/sys. Patching this out so that it builds. Not certain if
this will cause runtime failures.

nix/packages/perl-net-interface/net-interface-remove-grep-af-inet.patch

@@ -0,0 +1,16 @@
+diff --git a/Makefile.PL b/Makefile.PL
+index 973e65e..6ad0d51 100644
+--- a/Makefile.PL
++++ b/Makefile.PL
+@@ -176,11 +176,6 @@ unless (open(F,'./netsymbolC.inc')) {
+   exit;
+ }
+
+-unless (scalar grep {/# define\s+_NI_AF_INET/} (<F>)) {
+-  close F;
+-  die "AF_INET not found in netsymbolsC.inc,\nprerequisite development library header files missing from /usr/include/sys\n";
+-  exit 0;
+-}
+ close F;
+
+ WriteMakefile(%makeparms);

nix/packages/perl-net-interface/package.nix

@@ -1,29 +1,17 @@
 {
   perlPackages,
   fetchurl,
-  linuxHeaders,
-  which
 }:
-
 perlPackages.buildPerlPackage {
   pname = "NetInterface";
   version = "1.016";
-  buildInputs = [ linuxHeaders which ];
-  doCheck = false;
-
-  CPPFLAGS="-Iusr/include";
-
-  postPatch = ''
-    mkdir -p usr/include/sys/
-    cp -pr ${linuxHeaders}/include usr/
-    ln -s ${linuxHeaders}/include/linux/socket.h usr/include/sys/socket.h
-    ls -lahR usr/
-    echo "aaaaaaaa"
-    echo $CPPFLAGS
-  '';
 
   src = fetchurl {
     url = "mirror://cpan/authors/id/M/MI/MIKER/Net-Interface-1.016.tar.gz";
     hash = "sha256-e+RGk14BPQ7dPTcfkvuQo7s4q+mVYoidgXiVMSnlNQg=";
   };
+
+  patches = [ ./net-interface-remove-grep-af-inet.patch ];
+
+  doCheck = false;
 }