Drop "v" prefix from sprintf("%vd", $^V).

The sprintf documentation has this example:

   printf "version is v%vd\n", $^V;

and it printed 'version is vv5.9.3\n'.

p4raw-id: //depot/perl@26326

1 files changed, 4 insertions, 0 deletions

diff --git a/sv.c b/sv.c
index df957d51f3..e0165d4bd3 100644
--- a/sv.c
+++ b/sv.c
@@ -8011,6 +8011,10 @@ Perl_sv_vcatpvfn(pTHX_ SV *sv, const char *pat, STRLEN patlen, va_list *args, SV
 			q++; /* skip past the rest of the %vd format */
 			eptr = (const char *) vecstr;
 			elen = veclen;
+			if (elen && *eptr == 'v') {
+			    eptr++;
+			    elen--;
+			}
 			vectorize=FALSE;
 			goto string;
 		}