Backport of upstream commits 47cebaf and 78b993d

Fix kfreeBSD build warnings
--- a/freebsd/FreeBSDProcessList.c
+++ b/freebsd/FreeBSDProcessList.c
@@ -5,6 +5,8 @@
 in the source distribution for its full text.
 */
 
+#include "config.h" // IWYU pragma: keep
+
 #include "FreeBSDProcessList.h"
 
 #include <assert.h>
--- a/freebsd/Platform.c
+++ b/freebsd/Platform.c
@@ -5,6 +5,8 @@
 in the source distribution for its full text.
 */
 
+#include "config.h" // IWYU pragma: keep
+
 #include "Platform.h"
 
 #include <devstat.h>