Fixed the following issues:

Issue #1: make building tests optional; --without-tests is now supported as an argument to ./configure

Issue #2: Cross-compile fails on configure OpenSSL check; pkg-config solution fixed and merged

Issue #5: No ABI version numbering; spurious -avoid-version option to libtool removed

Also: made building with PC/SC lite optional; --without-pcsc is now supported as an argument to ./configure