Use "" not <> for internal/ includes

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4217)
diff --git a/test/lhash_test.c b/test/lhash_test.c
index 6deea8d..162286b 100644
--- a/test/lhash_test.c
+++ b/test/lhash_test.c
@@ -16,7 +16,7 @@
 #include <openssl/err.h>
 #include <openssl/crypto.h>
 
-#include <internal/nelem.h>
+#include "internal/nelem.h"
 #include "testutil.h"
 
 /*