shishi: Fix build

http://hydra.nixos.org/build/3884001

pkgs/servers/shishi/default.nix

@@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
     sha256 = "13c6w9rpaqb3am65nrn86byvmll5r78pld2vb0i68491vww4fzlx";
   };
 
+  patches = [ ./no-gets.patch ];
+
   buildInputs = [ libtasn1 libgcrypt gnutls ] ;
 
   doCheck = true;

pkgs/servers/shishi/no-gets.patch

@@ -0,0 +1,20 @@
+diff --git a/gl/stdio.in.h b/gl/stdio.in.h
+index 06d9780..fa04a10 100644
+--- a/gl/stdio.in.h
++++ b/gl/stdio.in.h
+@@ -713,10 +713,13 @@ _GL_CXXALIAS_SYS (gets, char *, (char *s));
+ # endif
+ _GL_CXXALIASWARN (gets);
+ /* It is very rare that the developer ever has full control of stdin,
+-   so any use of gets warrants an unconditional warning.  Assume it is
+-   always declared, since it is required by C89.  */
++   so any use of gets warrants an unconditional warning; besides C11
++   removed it.  */
++#ifdef gets
++#undef gets
+ _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+ #endif
++#endif
+ 
+ 
+ #if @GNULIB_OBSTACK_PRINTF@ || @GNULIB_OBSTACK_PRINTF_POSIX@