8237219: Disabling the native SunEC implementation

[Anthony Scarpino]

Hi

I need a review of the CSR and webrev for disabling by default the 
native SunEC curves from the API.  With the recent verification changes 
in JDK-8237218, SunJCE is long dependent on the native code for 
verifying the constant-time curves.  This disabling can be undone with 
setting a  system property, jdk.sunec.disableNative.  I'm doing a 
simultaneous review as changes for one  will likely affect the other.

CSR: https://bugs.openjdk.java.net/browse/JDK-8238911
webrev: https://cr.openjdk.java.net/~ascarpino/8237219/

The curves affected are:
secp112r1, secp112r2, secp128r1, secp128r2, secp160k1, secp160r1, 
secp160r2, secp192k1, secp192r1, secp224k1, secp224r1, secp256k1, 
sect113r1, sect113r2, sect131r1, sect131r2, sect163k1, sect163r1, 
sect163r2, sect193r1, sect193r2, sect233k1, sect233r1, sect239k1, 
sect283k1, sect283r1, sect409k1, sect409r1, sect571k1, sect571r1, X9.62 
c2tnb191v1, X9.62 c2tnb191v2, X9.62 c2tnb191v3, X9.62 c2tnb239v1, X9.62 
c2tnb239v2, X9.62 c2tnb239v3, X9.62 c2tnb359v1, X9.62 c2tnb431r1, X9.62 
prime192v2, X9.62 prime192v3, X9.62 prime239v1, X9.62 prime239v2, X9.62 
prime239v3, brainpoolP256r1 brainpoolP320r1, brainpoolP384r1, 
brainpoolP512r1

Tony