krb5 commit: Add MAXHOSTNAME guard in Windows public header

https://github.com/krb5/krb5/commit/3e3675ced526ff25267b318f293e66531382d257
commit 3e3675ced526ff25267b318f293e66531382d257
Author: Vipul Mehta <[email protected]>
Date:   Mon May 31 12:15:07 2021 +0530

    Add MAXHOSTNAME guard in Windows public header
    
    The ACE library defines a MAXHOSTNAMELEN macro, which conflicts if a
    source file includes headers from both libraries.
    
    ticket: 9010 (new)

 src/include/win-mac.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/include/win-mac.h b/src/include/win-mac.h
index dc0f2a1..0fd3a29 100644
--- a/src/include/win-mac.h
+++ b/src/include/win-mac.h
@@ -101,7 +101,10 @@ typedef _W64 int         ssize_t;
 #endif
 #endif /* KRB5_SYSTYPES__ */
 
+#ifndef MAXHOSTNAMELEN
 #define MAXHOSTNAMELEN  512
+#endif
+
 #ifndef MAXPATHLEN
 #define MAXPATHLEN      256            /* Also for Windows temp files */
 #endif