system/extras/verity: BoringSSL fix.

In BoringSSL, the functions that references BIOs have been moved out of
ERR in order to have some reasonable layering of the code.

A recent addition here referenced ERR_print_errors, which is now
BIO_print_errors in BoringSSL for that reason. Additionally, the
BoringSSL headers don't #include so many standard headers for you so an
explicit #include of errno.h is needed here.

Change-Id: Iebcc353b1354bd85d432deebeb7873aae46b0d2a
1 file changed