extconf.rb: apply RUBY_OPENSSL_EXT{C,LD}FLAGS after checking features #633
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RUBY_OPENSSL_EXTCFLAGS and RUBY_OPENSSL_EXTLDFLAGS have been added for the primary purpose of custom warning flags for development and CI.
Since checking programs generated by mkmf may not be completely warning-free, we don't want to apply -Werror that may be supplied from these environment variables.