Allow building on jdk 10/11

[Saityi]

As @Bost indicated after #224 was closed, cats does not compile when using jdk 10:

$ export JAVA_HOME=`/usr/libexec/java_home -v 10"
$ ./scripts/build
Exception in thread "main" java.lang.ClassNotFoundException: javax.xml.bind.DatatypeConverter, compiling:(cljs/util.cljc:1:1)
...

The issue is Clojurescript as of 1.9.946 uses a deprecated module, java.xml.bind.DataTypeConverter, which it cannot find as it has been made non-default. The latest version of Clojurescript does not have this issue:

$ git diff
...
-                 [org.clojure/clojurescript "1.9.946" :scope "provided"]
+                 [org.clojure/clojurescript "1.10.439" :scope "provided"]
...
$ git clean -dxf
...
$ ./scripts/build
...
...
... done. Elapsed 15.111055842 seconds

Tests pass, as well, with the newest Clojurescript version:

$ lein test
...
Ran 219 tests containing 374 assertions.
0 failures, 0 errors.

$ node out/tests.js
...
Ran 197 tests containing 340 assertions.
0 failures, 0 errors.

Also, jdk 11:

$ export JAVA_HOME=`/usr/libexec/java_home -v 11`
$ ./scripts/build
... done. Elapsed 24.733712635 seconds