Allow configure to detect if EC implementation is present

[Erik Joelsson]

On 2013-03-14 20:37, Omair Majid wrote:
> Andrew Hughes wrote the original changeset in the old build system [1]
> and I believe this is exactly what he wanted out of the changeset. I am
> CC'ing Erik, who wrote the TODO [2] so he can clarify what he meant.
>
>
I didn't actually create that comment in the first place, I just 
committed it as part of a big move of changes from the build-infra 
repos, where the work was done in small increments. Looking at this, I'm 
suspecting the comment was added due to this comment in 
jdk/make/sun/security/ec/Makefile:

#
# Some licensees do not get the native ECC sources, but we still need to
# be able to build "all" for them.  Check here to see if the sources are
# available.  If not, then skip them.
#

A usecase probably not that interesting to the OpenJDK community, but as 
Omair points out, it still applies, so I think this is a good idea. 
Adding a configure option for it would be nice too, but I don't see it 
as a requirement for this fix. I like the last suggestion with a clear 
yes/no with no double negatives, it looks ok.

And as David pointed out, please notify me and Tim Bell when you push 
this so we may have a chance at keeping the Oracle internal configure 
script up to date. Also please avoid pushing on a Wednesday as that's 
when the integration to master happens and the likelihood of bad timing 
increases. I don't like this complication any more than any of you, but 
for the time being, that's the way it is.

/Erik