vendor: update buildkit to master@8b7bcb900d3c

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/google.golang.org/grpc/dialoptions.go

@@ -44,6 +44,7 @@ func init() {
 		extraDialOptions = nil
 	}
 	internal.WithBinaryLogger = withBinaryLogger
+	internal.JoinDialOptions = newJoinDialOption
 }
 
 // dialOptions configure a Dial call. dialOptions are set by the DialOption
@@ -111,13 +112,28 @@ func newFuncDialOption(f func(*dialOptions)) *funcDialOption {
 	}
 }
 
+type joinDialOption struct {
+	opts []DialOption
+}
+
+func (jdo *joinDialOption) apply(do *dialOptions) {
+	for _, opt := range jdo.opts {
+		opt.apply(do)
+	}
+}
+
+func newJoinDialOption(opts ...DialOption) DialOption {
+	return &joinDialOption{opts: opts}
+}
+
 // WithWriteBufferSize determines how much data can be batched before doing a
 // write on the wire. The corresponding memory allocation for this buffer will
 // be twice the size to keep syscalls low. The default value for this buffer is
 // 32KB.
 //
-// Zero will disable the write buffer such that each write will be on underlying
-// connection. Note: A Send call may not directly translate to a write.
+// Zero or negative values will disable the write buffer such that each write
+// will be on underlying connection. Note: A Send call may not directly
+// translate to a write.
 func WithWriteBufferSize(s int) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.copts.WriteBufferSize = s
@@ -127,8 +143,9 @@ func WithWriteBufferSize(s int) DialOption {
 // WithReadBufferSize lets you set the size of read buffer, this determines how
 // much data can be read at most for each read syscall.
 //
-// The default value for this buffer is 32KB. Zero will disable read buffer for
-// a connection so data framer can access the underlying conn directly.
+// The default value for this buffer is 32KB. Zero or negative values will
+// disable read buffer for a connection so data framer can access the
+// underlying conn directly.
 func WithReadBufferSize(s int) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.copts.ReadBufferSize = s