Remove go:build ignore from convert_wycheproof

The reason to make it a package was to avoid needing this, but I missed
that git put it back.

Change-Id: Idd6df275aa964083db525d4d5e300128b204d973
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/59305
Commit-Queue: Bob Beck <bbe@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
Auto-Submit: David Benjamin <davidben@google.com>

util/convert_wycheproof/convert_wycheproof.go

diff --git a/util/convert_wycheproof/convert_wycheproof.go b/util/convert_wycheproof/convert_wycheproof.go
index 88a908d..076f8e4 100644
--- a/util/convert_wycheproof/convert_wycheproof.go
+++ b/util/convert_wycheproof/convert_wycheproof.go
@@ -12,8 +12,6 @@
 // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
-//go:build ignore
-
 // convert_wycheproof converts Wycheproof test vectors into a format more easily
 // consumed by BoringSSL.
 package main