kmd-test: fix build by removing unnecessary patch

Checked upstream

pkgs/kmd/default.nix

@@ -43,8 +43,6 @@ in
 
     inherit src version;
 
-    patches = [ ./missing_header.patch ];
-
     nativeBuildInputs = [ pkgs.gnumake ];
 
     buildPhase = ''

pkgs/kmd/missing_header.patch

@@ -1,24 +0,0 @@
-diff --git a/test/dma_buf.cpp b/test/dma_buf.cpp
-index a34bc44..95718a1 100644
---- a/test/dma_buf.cpp
-+++ b/test/dma_buf.cpp
-@@ -4,6 +4,7 @@
- #include <limits>
- #include <variant>
- #include <cerrno>
-+#include <cstdint>
- 
- #include <sys/ioctl.h>
- #include <sys/mman.h>
-diff --git a/test/lock.cpp b/test/lock.cpp
-index 941006e..0272126 100644
---- a/test/lock.cpp
-+++ b/test/lock.cpp
-@@ -3,6 +3,7 @@
- 
- #include <optional>
- #include <string>
-+#include <cstdint>
- 
- #include <errno.h>
- #include <sys/ioctl.h>