Don't forget hmac.h in self_check.h.

Builds that compile the FIPS stuff separately don't get this header from
other files.

Change-Id: I8a1b30ae360b08d4f4b9f804cd234998889477bc
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/51405
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/crypto/fipsmodule/self_check/self_check.c b/crypto/fipsmodule/self_check/self_check.c
index 8b15d83..5e790ba 100644
--- a/crypto/fipsmodule/self_check/self_check.c
+++ b/crypto/fipsmodule/self_check/self_check.c
@@ -25,6 +25,7 @@
 #include <openssl/ec.h>
 #include <openssl/ecdsa.h>
 #include <openssl/ec_key.h>
+#include <openssl/hmac.h>
 #include <openssl/nid.h>
 #include <openssl/rsa.h>
 #include <openssl/sha.h>