* Fix regressions in the `index' builtin. On glibc platforms, this avoids false positives from a strstr bug in glibc 2.9 through 2.12; on many other platforms, it fixes two separate regressions, a false positive introduced in 1.4.11 and a false negative in 1.4.15. * A number of portability improvements inherited from gnulib. OBS-URL: https://build.opensuse.org/package/show/Base:System/m4?expand=0&rev=11
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