CONFIG: ptscotch header not found on ArchLinux (fixes #1877)
- on ArchLinux, everything is installed under /usr/include/scotch. The detection script uses SCOTCH_ARCH_PATH as an initial guess for ptscotch as well. However, on the second pass, it has an absolute value ("/usr") instead of a logical one ("scotch-system"). This resulted in the logic for handling scotch+ptscotch subdirs being bypassed.
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