Add reallocarray to compat library
diff --git a/configure.ac b/configure.ac
index 8b59d91..5f5905b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1629,6 +1629,7 @@
 	prctl \
 	pstat \
 	readpassphrase \
+	reallocarray \
 	realpath \
 	recvmsg \
 	rresvport_af \