Convert poly1305 selftest into internal test

Reviewed-by: NEmilia Käsper <emilia@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1789)

crypto/poly1305/poly1305_local.h

+/*
+ * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+typedef void (*poly1305_blocks_f) (void *ctx, const unsigned char *inp,
+                                   size_t len, unsigned int padbit);
+typedef void (*poly1305_emit_f) (void *ctx, unsigned char mac[16],
+                                 const unsigned int nonce[4]);
+
+struct poly1305_context {
+    double opaque[24];  /* large enough to hold internal state, declared
+                         * 'double' to ensure at least 64-bit invariant
+                         * alignment across all platforms and
+                         * configurations */
+    unsigned int nonce[4];
+    unsigned char data[POLY1305_BLOCK_SIZE];
+    size_t num;
+    struct {
+        poly1305_blocks_f blocks;
+        poly1305_emit_f emit;
+    } func;
+};

test/build.info

@@ -298,6 +298,20 @@ IF[{- !$disabled{tests} -}]
     INCLUDE[cipher_overhead_test]=.. ../include
     DEPEND[cipher_overhead_test]=../libcrypto ../libssl
   ENDIF
+
+  IF[{- !$disabled{poly1305} -}]
+    PROGRAMS_NO_INST=poly1305_internal_test
+  ENDIF
+
+  SOURCE[poly1305_internal_test]=poly1305_internal_test.c testutil.c
+  IF[{- !$disabled{shared} -}]
+    SOURCE[poly1305_internal_test]= ../crypto/poly1305/poly1305.c \
+        {- $target{poly1305_asm_src} ? "../crypto/poly1305/".$target{poly1305_asm_src} : "" -} \
+        {- $target{cpuid_asm_src} ? "../crypto/".$target{cpuid_asm_src} : "" -} \
+        ../crypto/cryptlib.c
+  ENDIF
+  INCLUDE[poly1305_internal_test]=.. ../include ../crypto/include
+  DEPEND[poly1305_internal_test]=../libcrypto
 ENDIF
 
 {-