Improve build script#81

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deviance wants to merge 4 commits intocisco:mainfrom

deviance:master

Commits on Jul 17, 2020

java/jni/client.c: add support for OpenSSL 1.1
Aleksandr Makarov
committed
Add --{enable,disable}-examples flag to toggle examples compilation
Aleksandr Makarov
committed
Add --with-system-libsafec flag to link against system libsafec
Aleksandr Makarov
committed
configure.ac: Fix AC_ARG_ENABLE/AC_ARG_WITH macros
Aleksandr Makarov
committed