Fix configure options using AC_ARG_ENABLE Configure options to disable some features, which are checked using AC_ARG_ENABLE can be invoked with --enable-<option> as well. The current configure script always generates a #define for such options even though the --enable-<option> case should not generate a #define. Fix this by properly checking if the feature should be enabled, in which case no #define is being generated. Signed-off-by: Stefan Hauser <[email protected]>

stopped at ch12
-- needs examples for ecc/dsa!!! (and for asn.1)

must have for v1.16
- document PK build flags
- document makefile flags [INSTALL_* for instance]
- prepare manual for printing (both soft and hard cover)

Nice to have [in order of precedence]
- add X9.63 IES
- add CPP macros like OpenSSL has for ASN1 (e.g. encode/decode functions, etc) shameless ripoff :-)