MSVC seems to dislike the zero-array trick in C++, but not C. Turns out there
was no need for the include, so that's an easy fix.
Change-Id: I6def7b430a450c4ff7eeafa3611f0d40f5fc5945
Reviewed-on: https://boringssl-review.googlesource.com/4580
Reviewed-by: Adam Langley <agl@google.com>
RFC 5915 requires the use of the I2OSP primitive as defined in RFC 3447
for encoding ECPrivateKey. Fix this and add a test.
See also upstream's 30cd4ff294252c4b6a4b69cbef6a5b4117705d22, though it mixes
up degree and order.
Change-Id: I81ba14da3c8d69e3799422c669fab7f16956f322
Reviewed-on: https://boringssl-review.googlesource.com/4469
Reviewed-by: Adam Langley <agl@google.com>