vppinfra: Include param.h on FreeBSD

Type: improvement
Change-Id: I5fa90dd26d6cac2cefee009c97dd5ff8dac3ee1e
Signed-off-by: Tom Jones <thj@freebsd.org>
diff --git a/src/vppinfra/unix-misc.c b/src/vppinfra/unix-misc.c
index 29cbe0a..a72e55d 100644
--- a/src/vppinfra/unix-misc.c
+++ b/src/vppinfra/unix-misc.c
@@ -42,8 +42,9 @@
 #include <vppinfra/format.h>
 #ifdef __linux__
 #include <vppinfra/linux/sysfs.h>
-#else
+#elif defined(__FreeBSD__)
 #include <sys/sysctl.h>
+#include <sys/param.h>
 #endif
 
 #include <sys/stat.h>