perl: remove sw_vers darwin patch

The patch fails to apply on 5.42.

It's no longer needed since:
https://github.com/Perl/perl5/commit/55b5890c26936402c07d7ae9e41b2b9842e36842

pkgs/development/interpreters/perl/interpreter.nix

@@ -37,10 +37,7 @@ let
     ./no-sys-dirs.patch
   ]
   ++ lib.optional stdenv.hostPlatform.isSunOS ./ld-shared.patch
-  ++ lib.optionals stdenv.hostPlatform.isDarwin [
-    ./cpp-precomp.patch
-    ./sw_vers.patch
-  ]
+  ++ lib.optional stdenv.hostPlatform.isDarwin ./cpp-precomp.patch
   ++ lib.optional crossCompiling ./cross.patch;
 
   libc = if stdenv.cc.libc or null != null then stdenv.cc.libc else "/usr";

pkgs/development/interpreters/perl/sw_vers.patch

@@ -1,13 +0,0 @@
-diff --git a/hints/darwin.sh b/hints/darwin.sh
-index afadf53..80b7533 100644
---- a/hints/darwin.sh
-+++ b/hints/darwin.sh
-@@ -329,7 +329,7 @@ EOM
-     # sw_vers output                 what we want
-     # "ProductVersion:    10.10.5"   "10.10"
-     # "ProductVersion:    10.11"     "10.11"
--        prodvers=`sw_vers|awk '/^ProductVersion:/{print $2}'|awk -F. '{print $1"."$2}'`
-+        prodvers="${MACOSX_DEPLOYMENT_TARGET:-10.12}"
-     case "$prodvers" in
-     10.*)
-       add_macosx_version_min ccflags $prodvers