8327998: Enable java/lang/ProcessBuilder/JspawnhelperProtocol.java on Mac

Reviewed-by: gli, shade, rriggs

Author: elifaslan1

test/jdk/java/lang/ProcessBuilder/JspawnhelperProtocol.java

@@ -25,7 +25,7 @@
 /*
  * @test
  * @bug 8307990
- * @requires (os.family == "linux") | (os.family == "aix")
+ * @requires (os.family == "linux") | (os.family == "aix") | (os.family == "mac")
  * @requires vm.debug
  * @requires vm.flagless
  * @library /test/lib