These cpp files reference SYS_* macros but do not explicitly include syscall.h as required.

diff '--color=auto' -ur a/src/mongo/util/stacktrace_details.cpp b/src/mongo/util/stacktrace_details.cpp
--- a/src/mongo/util/stacktrace_details.cpp	2026-06-15 18:37:04.000000000 -0400
+++ b/src/mongo/util/stacktrace_details.cpp	2026-06-16 14:31:50.121848572 -0400
@@ -34,6 +34,7 @@
 #include "mongo/base/parse_number.h"
 
 #include <unistd.h>
+#include <syscall.h>
 
 #include <boost/filesystem/directory.hpp>
 #include <boost/filesystem/fstream.hpp>
diff '--color=auto' -ur a/src/mongo/util/stacktrace_test.cpp b/src/mongo/util/stacktrace_test.cpp
--- a/src/mongo/util/stacktrace_test.cpp	2026-06-15 18:37:04.000000000 -0400
+++ b/src/mongo/util/stacktrace_test.cpp	2026-06-16 14:31:46.751895923 -0400
@@ -34,7 +34,7 @@
 #include <fmt/format.h>
 #include <fmt/printf.h>  // IWYU pragma: keep
 #include <fmt/ranges.h>  // IWYU pragma: keep
-// IWYU pragma: no_include "syscall.h"
+#include "syscall.h"
 // IWYU pragma: no_include "cxxabi.h"
 #include "mongo/base/parse_number.h"
 #include "mongo/bson/bsonelement.h"