Fix AS_VAR_* checks #14868
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Fix AS_VAR_* checks #14868
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AS_VAR_SET_IF doesn't behave the same as "test -n" and/or "test -z", which becomes an issue for Apache's ZTS automatic enabling and CFLAGS edge case where it would be explicitly set to empty value. It is safer to use AS_VAR_IF instead of AS_VAR_SET_IF in these cases.
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AS_VAR_SET_IF doesn't behave the same as "test -n" and/or "test -z", which becomes an issue for Apache's ZTS automatic enabling and CFLAGS edge case where it would be explicitly set to empty value. It is safer to use AS_VAR_IF instead of AS_VAR_SET_IF in these cases.
My bad for introducing that AS_VAR_SET_IF. Haven't noticed the issue behind it. Now is fixed.