Follow-up to r1028084 that will also search Xcode for a suitable JDK.
Follow-up to r1028084 that will also search Xcode for a suitable JDK.

* build/ac-macros/java.m4: Enhanced to search for a suitable JDK in Xcode.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion