slurm-spank-stunnel: add backward compatibility patch

pkgs/by-name/sl/slurm-spank-stunnel/backward-compat.patch

@@ -0,0 +1,15 @@
+diff --git a/slurm-spank-stunnel.c b/slurm-spank-stunnel.c
+index b79cea0..c135bf5 100644
+--- a/slurm-spank-stunnel.c
++++ b/slurm-spank-stunnel.c
+@@ -41,6 +41,10 @@
+ #include <arpa/inet.h>
+ #include <errno.h>
+ 
++#ifndef SLURM_BACKWARD_COMPAT
++#define SLURM_BACKWARD_COMPAT 1
++#endif
++
+ #include <slurm/slurm.h>
+ #include <slurm/spank.h>
+ 

pkgs/by-name/sl/slurm-spank-stunnel/package.nix

@@ -16,7 +16,10 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "15cpd49ccvzsmmr3gk8svm2nz461rvs4ybczckyf4yla0xzp06gj";
   };
 
-  patches = [ ./hostlist.patch ];
+  patches = [
+    ./hostlist.patch
+    ./backward-compat.patch
+  ];
 
   buildPhase = ''
     gcc -I${lib.getDev slurm}/include -shared -fPIC -o stunnel.so slurm-spank-stunnel.c