Fix build tag for WASI (#1)

Author: emcfarlane

main_unix.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris
+//go:build unix || js || wasip1
 
 package pluginrpc