drbd: fix build w/glibc-2.30

Decided to not bump to a later version as they decided to split the repo
which would've made change way more complicated.

pkgs/os-specific/linux/drbd/default.nix

@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "1w4889h1ak7gy9w33kd4fgjlfpgmp6hzfya16p1pkc13bjf22mm0";
   };
 
-  patches = [ ./pass-force.patch ];
+  patches = [ ./pass-force.patch ./fix-glibc-compilation.patch ];
 
   nativeBuildInputs = [ flex ];
   buildInputs = [ perl ];

pkgs/os-specific/linux/drbd/fix-glibc-compilation.patch

@@ -0,0 +1,24 @@
+diff --git a/user/drbdadm_adjust.c b/user/drbdadm_adjust.c
+index cb23270..3a751ca 100644
+--- a/user/drbdadm_adjust.c
++++ b/user/drbdadm_adjust.c
+@@ -29,6 +29,7 @@
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #include <sys/wait.h>
++#include <sys/sysmacros.h>
+ #include <unistd.h>
+ #include <fcntl.h>
+ 
+diff --git a/user/legacy/drbdadm_adjust.c b/user/legacy/drbdadm_adjust.c
+index c79163c..6990ffb 100644
+--- a/user/legacy/drbdadm_adjust.c
++++ b/user/legacy/drbdadm_adjust.c
+@@ -27,6 +27,7 @@
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #include <sys/wait.h>
++#include <sys/sysmacros.h>
+ #include <unistd.h>
+ #include <fcntl.h>
+