NetBSD: hmac() conflict with stdlib.h

[moubctez]

Building 1.20.3 on NetBSD gives error:

./../include/sha.h:314:12: error: conflicting types for 'hmac'; have 'int(SHAversion,  const unsigned char *, size_t,  const unsigned char *, size_t,  uint8_t *)' {aka 'int(SHAversion,  const unsigned char *, long unsigned int,  const unsigned char *, long unsigned int,  unsigned char *)'}
  314 | extern int hmac (SHAversion whichSha,   /* which SHA algorithm to use */
      |            ^~~~
In file included from login.c:41:
/usr/include/stdlib.h:309:10: note: previous declaration of 'hmac' with type 'ssize_t(const char *, const void *, size_t,  const void *, size_t,  void *, size_t)' {aka 'long int(const char *, const void *, long unsigned int,  const void *, long unsigned int,  void *, long unsigned int)'}
  309 | ssize_t  hmac(const char *, const void *, size_t, const void *, size_t, void *,
      |          ^~~~

From what I can see, hmac definition are not used and can be removed, solving the problem:

--- include/sha.h.orig	2026-08-07 07:44:14.462361966 +0000
+++ include/sha.h
@@ -305,6 +305,7 @@ extern int USHAHashSizeBits (enum SHAversion whichSha)
 extern int USHAHashSize (enum SHAversion whichSha);
 extern int USHAHashSizeBits (enum SHAversion whichSha);
 
+#if 0
 /*
  * HMAC Keyed-Hashing for Message Authentication, RFC2104,
  * for all SHAs.
@@ -330,5 +331,6 @@ extern int hmacResult (HMACContext * ctx, uint8_t *dig
 extern int hmacFinalBits (HMACContext * ctx, const uint8_t bits,
 			  size_t bitcount);
 extern int hmacResult (HMACContext * ctx, uint8_t *digest);
+#endif
 
 #endif /* _SHA_H_ */