xidel: fix for darwin

On darwin, the tool was linked to system libcrypto.dylib and failed to
start with:

```
Invalid dylib load. Clients should not load the unversioned libcrypto
dylib as it does not have a stable ABI.
abort() called
```

pkgs/tools/text/xidel/default.nix

@@ -62,10 +62,14 @@ in stdenv.mkDerivation rec {
   preBuildPhase = ''
     mkdir -p import/{flre,synapse,pasdblstrutils} rcmdline internettools
     cp -R ${flreSrc}/. import/flre
-    cp -R ${synapseSrc}/. import/synapse
     cp -R ${pasdblstrutilsSrc}/. import/pasdblstrutils
     cp -R ${rcmdlineSrc}/. rcmdline
     cp -R ${internettoolsSrc}/. internettools
+
+    cp -R ${synapseSrc}/. import/synapse
+    substituteInPlace import/synapse/ssl_openssl{,11}_lib.pas \
+      --replace-fail 'libcrypto.dylib' '${lib.getLib openssl}/lib/libcrypto.dylib' \
+      --replace-fail 'libssl.dylib' '${lib.getLib openssl}/lib/libssl.dylib'
   '';
 
   buildPhase = ''