• Do not hardcode dependency on GnuTLS (security/gnutls). While preferred, it is not required, and limited functionality can be achieved by using OpenSSL instead (per the comment in configure script); both providers can be turned off with --disable-{tls,openssl} switches
• Similarly, make ICU support optional as well and replace cryptic regex in BASEVERSION assignment with :R while here

Approved by: theraven (maintainer)