devel/etcd31: fix build on riscv64

[fuz]

Summary

devel/etcd31: fix build on riscv64

Bump golang.org/x/sys and github.com/coreos/bbolt to versions that
support risc64-freebsd.

Sponsored by:	Berliner Linux User Group e.V.
Approved by:	portmgr (build fix blanket)
Approved by:	... (mentor)

Test Plan

Tested manually on riscv64 FreeBSD 13.1.
Tested with Poudriere on arm64 i386 amd64 FreeBSD 12.4 13.1.
See http://fuz.su/~fuz/freebsd/batch6

[eduardo]

no PORTREVISION bump needed, no pkg were built

[fuz]

Packages exist for other architectures and this bump changes the versions of dependencies used in them, hence I believe a PORTREVISION bump is appropriate.

[flo]

In D38863#884950, @fuz wrote:

Packages exist for other architectures and this bump changes the versions of dependencies used in them, hence I believe a PORTREVISION bump is appropriate.

Yeah, I think it is indeed correct to bump the PORTREVISION, the dependencies change and due to go's static linking a completely new package is the result, either would be enough to bump.

devel/etcd31/Makefile

 }
 
 static inline char *
 kstrdup(const char *string, gfp_t gfp)
 {
         char *retval;
         size_t len;
 
+        if (string == NULL)
+                return (NULL);
         len = strlen(string) + 1;
         retval = kmalloc(len, gfp);
         if (retval != NULL)
                 memcpy(retval, string, len);
         return (retval);
 }
 
 static inline char *
 kstrndup(const char *string, size_t len, gfp_t gfp)
 {
         char *retval;
 
+        if (string == NULL)
+                return (NULL);
         retval = kmalloc(len + 1, gfp);
         if (retval != NULL)
                 strncpy(retval, string, len);
         return (retval);
 }
 
 static inline const char *
 kstrdup_const(const char *src, gfp_t gfp)

devel/etcd31/distinfo

 }
 
 static inline char *
 kstrdup(const char *string, gfp_t gfp)
 {
         char *retval;
         size_t len;
 
+        if (string == NULL)
+                return (NULL);
         len = strlen(string) + 1;
         retval = kmalloc(len, gfp);
         if (retval != NULL)
                 memcpy(retval, string, len);
         return (retval);
 }
 
 static inline char *
 kstrndup(const char *string, size_t len, gfp_t gfp)
 {
         char *retval;
 
+        if (string == NULL)
+                return (NULL);
         retval = kmalloc(len + 1, gfp);
         if (retval != NULL)
                 strncpy(retval, string, len);
         return (retval);
 }
 
 static inline const char *
 kstrdup_const(const char *src, gfp_t gfp)