Merge r727052 from trunk:

* Similar to apr_strtoff reset errno to zero in apr_strtoi64.
  Cases were observed where apr_strtoi64 returned with a
    previously set errno although the operation worked fine.
    
    Submitted by: rpluem
    Reviewed by: rpluem
    

Index: strings/apr_strings.c
===================================================================
--- strings/apr_strings.c	(revision 647686)
+++ strings/apr_strings.c	(revision 727605)
@@ -245,6 +245,7 @@
 APR_DECLARE(apr_int64_t) apr_strtoi64(const char *nptr, char **endptr, int base)
 {
 #ifdef APR_INT64_STRFN
+    errno = 0;
     return APR_INT64_STRFN(nptr, endptr, base);
 #else
     const char *s;
@@ -253,6 +254,7 @@
     int neg, any;
     char c;
 
+    errno = 0;
     /*
      * Skip white space and pick up leading +/- sign if any.
      * If base is 0, allow 0x for hex and 0 for octal, else