qt58.qtbase: remove SSL decryption patch

This option does not require a patch; it can be enabled through
NIX_CFLAGS_COMPILE.

pkgs/development/libraries/qt-5/5.8/qtbase/decrypt-ssl-traffic.patch

@@ -1,13 +0,0 @@
-Index: qtbase-opensource-src-5.5.1/src/network/ssl/qsslsocket_openssl.cpp
-===================================================================
---- qtbase-opensource-src-5.5.1.orig/src/network/ssl/qsslsocket_openssl.cpp
-+++ qtbase-opensource-src-5.5.1/src/network/ssl/qsslsocket_openssl.cpp
-@@ -48,7 +48,7 @@
- ****************************************************************************/
- 
- //#define QSSLSOCKET_DEBUG
--//#define QT_DECRYPT_SSL_TRAFFIC
-+#define QT_DECRYPT_SSL_TRAFFIC
- 
- #include "qssl_p.h"
- #include "qsslsocket_openssl_p.h"

pkgs/development/libraries/qt-5/5.8/qtbase/default.nix

@@ -38,8 +38,7 @@ stdenv.mkDerivation {
 
   patches =
     copyPathsToStore (lib.readPathsFromFile ./. ./series)
-    ++ [(if stdenv.isDarwin then ./cmake-paths-darwin.patch else ./cmake-paths.patch)]
+    ++ [(if stdenv.isDarwin then ./cmake-paths-darwin.patch else ./cmake-paths.patch)];
-    ++ lib.optional decryptSslTraffic ./decrypt-ssl-traffic.patch;
 
   postPatch =
     ''
@@ -249,7 +248,9 @@ stdenv.mkDerivation {
       # Note that nixpkgs's objc4 is from macOS 10.11 while the SDK is
       # 10.9 which necessitates the above macro definition that mentions
       # 10.10
-    ];
+    ]
+
+    ++ lib.optional decryptSslTraffic "-DQT_DECRYPT_SSL_TRAFFIC";
 
   postInstall = ''
     find "$out" -name "*.cmake" | while read file; do