yubikey-agent: fix on darwin

Mea culpa: in #92936, I did originally test on macOS but I forgot to
retest after adding the piv-go patch.  Unfortunately, the piv-go patch
was broken on macOS.  This pulls in the latest version of
go-piv/piv-go#75 which works on macOS now.

pkgs/tools/security/yubikey-agent/default.nix

@@ -25,7 +25,7 @@ buildGoModule rec {
     substituteInPlace main.go --replace 'notify-send' ${libnotify}/bin/notify-send
   '';
 
-  vendorSha256 = "1x7934p6522i0yyv08xzb4134d0kr5x6igsrp26vh79d8fndbywr";
+  vendorSha256 = "128mlsagj3im6h0p0ndhzk29ya47g19im9dldx3nmddf2jlccj2h";
 
   subPackages = [ "." ];
 

pkgs/tools/security/yubikey-agent/use-piv-go-75.patch

@@ -1,24 +1,22 @@
-From 56a465d463273b2a2a24cf668c4c33938b198b16 Mon Sep 17 00:00:00 2001
+From 547695fff9cbfc4037168cdeb07cfe16bd89b6db Mon Sep 17 00:00:00 2001
 From: Philip Potter <philip.g.potter@gmail.com>
-Date: Sun, 12 Jul 2020 16:54:57 +0100
-Subject: [PATCH] Pull in go-piv/piv-go#75
+Date: Sat, 25 Jul 2020 21:59:50 +0100
+Subject: [PATCH] Pull in piv-go#75
 
 ---
- go.mod | 1 +
- 1 file changed, 1 insertion(+)
+ go.mod | 2 ++
+ 1 file changed, 2 insertions(+)
 
 diff --git a/go.mod b/go.mod
-index d4d13c8..e24d53d 100644
+index d4d13c8..f75be2d 100644
 --- a/go.mod
 +++ b/go.mod
-@@ -2,6 +2,7 @@ module filippo.io/yubikey-agent
- 
- go 1.14
- 
-+replace github.com/go-piv/piv-go => github.com/rawkode/piv-go v1.5.1-0.20200711221619-a4158f9b8204
- require (
- 	github.com/go-piv/piv-go v1.5.1-0.20200523071327-a3e5767e8b72
+@@ -7,3 +7,5 @@ require (
  	github.com/gopasspw/gopass v1.9.1
+ 	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
+ )
++
++replace github.com/go-piv/piv-go => github.com/rawkode/piv-go v1.5.1-0.20200725154545-1c3200c75a28
 -- 
 2.27.0