Remove hmac.h include from ssl.h.

This workaround was added in https://boringssl-review.googlesource.com/21664,
but the correct <openssl/hmac.h> include was added to NGINX over 5 years ago
in https://hg.nginx.org/nginx/rev/8076ba459f05, so this is no longer needed.

Change-Id: I30571871b336e1f68d385202bcc8836a621e0204
Signed-off-by: Piotr Sikora <piotr@aviatrix.com>
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/56085
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

include/openssl/ssl.h

@@ -157,11 +157,6 @@
 #include <sys/time.h>
 #endif
 
-// NGINX needs this #include. Consider revisiting this after NGINX 1.14.0 has
-// been out for a year or so (assuming that they fix it in that release.) See
-// https://boringssl-review.googlesource.com/c/boringssl/+/21664.
-#include <openssl/hmac.h>
-
 // Forward-declare struct timeval. On Windows, it is defined in winsock2.h and
 // Windows headers define too many macros to be included in public headers.
 // However, only a forward declaration is needed.

ssl/test/test_config.cc

@@ -28,6 +28,7 @@
 #include <type_traits>
 
 #include <openssl/base64.h>
+#include <openssl/hmac.h>
 #include <openssl/hpke.h>
 #include <openssl/rand.h>
 #include <openssl/span.h>