bridge-utils: fix cross-compilation

pkgs/os-specific/linux/bridge-utils/autoconf-ar.patch

@@ -0,0 +1,25 @@
+diff --git a/configure.in b/configure.in
+index 5e3f89b..19be6d9 100644
+--- a/configure.in
++++ b/configure.in
+@@ -9,6 +9,7 @@ dnl Checks for programs.
+ AC_PROG_CC
+ AC_PROG_INSTALL
+ AC_PROG_RANLIB
++AC_CHECK_TOOL([AR], [ar])
+ 
+ dnl Checks for header files.
+ AC_HEADER_STDC
+diff --git a/libbridge/Makefile.in b/libbridge/Makefile.in
+index 20512c4..83c802b 100644
+--- a/libbridge/Makefile.in
++++ b/libbridge/Makefile.in
+@@ -1,7 +1,7 @@
+ 
+ KERNEL_HEADERS=-I@KERNEL_HEADERS@
+ 
+-AR=ar
++AR=@AR@
+ RANLIB=@RANLIB@
+ 
+ CC=@CC@

pkgs/os-specific/linux/bridge-utils/default.nix

@@ -8,11 +8,12 @@ stdenv.mkDerivation rec {
     sha256 = "42f9e5fb8f6c52e63a98a43b81bd281c227c529f194913e1c51ec48a393b6688";
   };
 
-  # Remove patch once the kernel headers are updated
-  patches = [ ./add-ip6-header.patch ];
+  patches = [
+    ./autoconf-ar.patch
+    ./add-ip6-header.patch # Remove patch once the kernel headers are updated
+  ];
 
   nativeBuildInputs = [ autoreconfHook ];
-  buildInputs = [ ];
 
   postInstall = ''
     # The bridge utils build does not fail even if the brctl binary