Follow variable naming convention

Follow variable naming convention

* src/gnutls.c (QCgnutls_bootprop_priority)
(QCgnutls_bootprop_trustfiles, QCgnutls_bootprop_keylist)
(QCgnutls_bootprop_crlfiles, QCgnutls_bootprop_callbacks)
(QCgnutls_bootprop_loglevel, QCgnutls_bootprop_hostname)
(QCgnutls_bootprop_min_prime_bits, QCgnutls_bootprop_verify_flags)
(QCgnutls_bootprop_verify_hostname_error)
(QCgnutls_bootprop_callbacks_verify): Rename from
Qgnutls_bootprop_..., all uses changed.

* src/xfaces.c (QCignore_defface): Rename from Qignore_defface, all
uses changed.