Allow configure to detect if EC implementation is present

[Omair Majid]

Hi,

jdk/makefiles/CompileNativeLibraries.gmk has a little note:

TODO Set DISABLE_INTREE_EC in configure if
src/share/native/sun/security/ec/impl is not present

The webrev at http://cr.openjdk.java.net/~omajid/webrevs/intree-ec/00/
implements this. Does this look okay for jdk8/build ? Can I get a bug id?

Thanks,
Omair

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