krb5: remove some obsolete patches

Signed-off-by: W. Michael Petullo <mike@flyn.org>

net/krb5/patches/001-fix-build-warning.patch

@@ -1,12 +0,0 @@
-diff -ur krb5-1.11-vanilla/src/lib/krb5/krb/preauth2.c krb5-1.11/src/lib/krb5/krb/preauth2.c
---- krb5-1.11-vanilla/src/lib/krb5/krb/preauth2.c	2012-12-18 03:47:05.000000000 +0100
-+++ krb5-1.11/src/lib/krb5/krb/preauth2.c	2013-02-18 03:53:20.580840173 +0100
-@@ -956,7 +956,7 @@
-     size_t i, h;
-     int out_pa_list_size = 0;
-     krb5_pa_data **out_pa_list = NULL;
--    krb5_error_code ret, module_ret;
-+    krb5_error_code ret, module_ret = 0;
-     krb5_responder_fn responder = opte->opt_private->responder;
-     static const int paorder[] = { PA_INFO, PA_REAL };
-