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7a0aa99e51
This reverts commit 704ef84ef2.
The configure solution in that commit doesn't work if llvm-config
returns a system directory such as /usr/include. The resulting
-isystem /usr/include puts the C headers before the C++ headers in the
include file order, which is not supposed to be done and causes
failures. (Using -I /usr/include doesn't have that problem because it
is handled specially by the compiler.) Per buildfarm members
hippopotamus and jay.
The meson solution does work because it specifically filters out
system includes. This logic could theoretically be ported to
configure, but that would be a separate undertaking.