gnu: java-commons-lang: Disable failing test.

* gnu/packages/java.scm (java-commons-lang)[arguments]: Modify #:test-exclude
to disable randomly failing tests.

The testsuite include tests about distribution of random inputs,
meaning that they can randomly fail. Disable them to avoid build failures.

Signed-off-by: Chris Marusich <cmmarusich@gmail.com>

gnu/packages/java.scm

@@ -3272,6 +3272,7 @@ file filters and endian classes.")
     (outputs '("out" "doc"))
     (arguments
      `(#:test-target "test"
+       #:test-exclude (list "**/Abstract*.java" "**/Random*.java")
        #:phases
        (modify-phases %standard-phases
          (add-after 'build 'build-javadoc ant-build-javadoc)