MDEV-8973 Build failure on missing alloca.h

in *BSD family alloca() is in stdlib.h

include/mysql/service_encryption.h

@@ -34,6 +34,8 @@ extern "C" {
 #ifndef __cplusplus
 #define inline __inline
 #endif
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
+#include <stdlib.h>
 #else
 #include <alloca.h>
 #endif