build: Consistently use AS_IF instead of if/then/fi #441
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AS_IF is best-practice for Autoconf, because it resolves conditional
dependencies correctly; for example, if the first use of
PKG_CHECK_MODULES is inside an if/then/fi block, then
PKG_CHECK_PKG_CONFIG will also be conditional, but if the first use of
PKG_CHECK_MODULES is inside AS_IF, then PKG_CHECK_PKG_CONFIG will be
done unconditionally.