configure: fix configure output for --enable-optimize
configure: fix configure output for --enable-optimize

Don't write two messages at the same time.  Move the _FORTIFY_SOURCE
check down, to avoid writing two messages at the same line.  This has
the extra of checking this flag also for non-GCC compilers, which may
make sense since it is a pre-processor step that regardless compiler
might enable something in the (system) header files.

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