gnu: capnproto: Fix tests.

* gnu/packages/patches/capnproto-fix-test.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/serialization.scm (capnproto)[source]: Use it.

Change-Id: I216563e5263f6d4e61e382b8d1eb5687c82b0cc1

gnu/local.mk

@@ -1089,6 +1089,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/calls-disable-application-test.patch	\
   %D%/packages/patches/calls-disable-sip-test.patch		\
   %D%/packages/patches/camlboot-dynamically-allocate-stack-signal.patch	\
+  %D%/packages/patches/capnproto-fix-test.patch		\
   %D%/packages/patches/capstone-fix-python-constants.patch	\
   %D%/packages/patches/catdoc-CVE-2017-11110.patch		\
   %D%/packages/patches/ccextractor-add-missing-header.patch	\

gnu/packages/patches/capnproto-fix-test.patch

@@ -0,0 +1,11 @@
+diff -u a/src/kj/string-test.c++ b/src/kj/string-test.c++
+--- a/src/kj/string-test.c++
++++ b/src/kj/string-test.c++
+@@ -22,6 +22,7 @@
+ #include "string.h"
+ #include <kj/compat/gtest.h>
+ #include <string>
++#include <cstdint>
+ #include "vector.h"
+ 
+ namespace kj {

gnu/packages/serialization.scm

@@ -742,7 +742,8 @@ This package also provides @samp{kdlpp}, a C++20 wrapper around @samp{ckdl}.")
                     version ".tar.gz"))
               (sha256
                (base32
-                "03f1862ljdshg7d0rg3j7jzgm3ip55kzd2y91q7p0racax3hxx6i"))))
+                "03f1862ljdshg7d0rg3j7jzgm3ip55kzd2y91q7p0racax3hxx6i"))
+              (patches (search-patches "capnproto-fix-test.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases