Update autoconf/automake scripts to address warnings with autoconf >=2.70
Description
!1630 (merged) exposed a number of warnings related to using obsolete/deprecated autoconf macros, this MR addresses those such that lalsuite now properly supports autoconf >=2.70 (which isn't really available anywhere useful yet).
API Changes and Justification
Backwards Compatible Changes
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This change adds new API calls
Backwards Incompatible Changes
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Review Status
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