crypto/x509: Fix handling of pathLenConstraint on self-issued intermediates.
The test case that fails before this CL is:
```
EXPECT_EQ(X509_V_ERR_PATH_LENGTH_EXCEEDED,
VerifyChain({{/*self_issued=*/false, /*pathlen=/0},
{/*self_issued=*/false, /*pathlen=/0},
{/*self_issued=*/true, /*pathlen=/0},
{/*self_issued=*/false, /*pathlen=/1},
{/*self_issued=*/true, /*pathlen=/2}}));
```
as the path length of the migrating-to (and self-issued) intermediate
certificate was ignored.
Bug: 525690632
Change-Id: Id5d74cc3f93156d40db61dc83433e4dc6a6a6964
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/95067
Commit-Queue: Rudolf Polzer <rpolzer@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
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