https://github.com/qpdf/qpdf/commit/6918f0b7eb0160059d712ee19ba0ce2d65b9f89c

From: Christopher Fore <csfore@posteo.net>
Date: Mon, 5 Aug 2024 09:41:50 -0400
Subject: [PATCH] libtests: include cstdint for GCC 15
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GCC 15 starts to no longer include this by default, requiring it to be
explicitly included.

Error message:
libtests/cxx11.cc:75:16: error: ‘uint8_t’ was not declared in this scope
   75 |     check_size<uint8_t>(1, false);
      |                ^~~~~~~
libtests/cxx11.cc:10:1: note: ‘uint8_t’ is defined in header ‘<cstdint>’; this is probably fixable by adding ‘#include <cstdint>’
    9 | #include <regex>
  +++ |+#include <cstdint>
   10 | #include <type_traits>

Signed-off-by: Christopher Fore <csfore@posteo.net>
---
 libtests/cxx11.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libtests/cxx11.cc b/libtests/cxx11.cc
index 59c74fa86..953ad00f9 100644
--- a/libtests/cxx11.cc
+++ b/libtests/cxx11.cc
@@ -1,5 +1,6 @@
 #include <qpdf/assert_test.h>
 
+#include <cstdint>
 #include <cstdlib>
 #include <cstring>
 #include <functional>