catch: fix build w/glibc-2.34

The issue was that `SIGSTKSZ` isn't an actual const anymore and thus
can't be used to define sizes of static variables such as

    static char foo[SIGSTKSZ];

since this results in compiler errors such as

    error: array bound is not an integer constant before ']' token

Fedora worked around this by hard-coding the value in `catch`. Since
this is mainly a testing-framework and there's no other fix for v1 - we
should eventually remove it entirely in favor of v2 anyways - I guess
this is a good-enough fix.

Failing Hydra build: https://hydra.nixos.org/build/152455108

pkgs/development/libraries/catch/default.nix

@@ -20,6 +20,12 @@ stdenv.mkDerivation rec {
       url = "https://github.com/catchorg/Catch2/commit/bb6d08323f23a39eb65dd86671e68f4f5d3f2d6c.patch";
       sha256 = "1vhbzx84nrhhf9zlbl6h5zmg3r5w5v833ihlswsysb9wp2i4isc5";
     })
+
+    # Fix glibc-2.34 build
+    (fetchpatch {
+      url = "https://src.fedoraproject.org/rpms/catch1/raw/23276476148a657e7a45ade547f858cbf965a33a/f/catch1-sigstksz.patch";
+      sha256 = "sha256-XSsI3iDEZCUSbozlYWC0y/LZ7qr/5zwACpn1jHKD0yU=";
+    })
   ];
 
   doCheck = true;