tcpreplay: remove workaround

This was fixed in appneta/tcpreplay#694.

Also, fix `libdnet` detection, which currently isn't linked on ARM.

Formula/tcpreplay.rb

@@ -30,21 +30,12 @@ def install
       --disable-silent-rules
       --prefix=#{prefix}
       --enable-dynamic-link
+      --with-libdnet=#{Formula["libdnet"].opt_prefix}
     ]
 
     args << if OS.mac?
       ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version
 
-      # The SDK is currently found using `xcrun --sdk macosx<V>` starting with
-      # input `--with-macosx-sdk=<V>` and then going from older 10.8 onward.
-      # On ARM, for Big Sur 11.4 the correct SDK is 11.3 (as of 2021-07-11);
-      # however, the logic picks 10.15, which causes configure failure.
-      # As a workaround, we remove all 10.x versions from SDK detection logic.
-      #
-      # Check in next release if the workaround can be removed.
-      # Upstream issue: https://github.com/appneta/tcpreplay/issues/668
-      inreplace "configure.ac", /(\$with_macosx_sdk\s+)(?:10\.\d+\s+)+/, "\\1" if Hardware::CPU.arm?
-
       "--with-macosx-sdk=#{MacOS.version}"
     else
       "--with-libpcap=#{Formula["libpcap"].opt_prefix}"