configure : LLVM and LD detections improvements (#10234).
* distrib/configure.ac.in : Detect correct version of LLVM tools as was done for the top level configure.ac in 42448e37. * aclocal.m4 : Add a FIND_LD macro that can be used in both configure scripts. * Use new FIND_LD macro in both configure scripts. Signed-off-by: Erik de Castro Lopo <email@example.com> Test Plan: validate on amd64-linux and armhf-linux. Reviewers: rwbarton, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D828 GHC Trac Issues: #10234
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