Remove subshells and fix invalid test syntax
Building with CONFIG_SHELL=/bin/dash fails due to non-POSIX expressions. This patch should cover all occurrences in autoconf/automake and scripts using /bin/sh in their shebang.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Building with CONFIG_SHELL=/bin/dash fails due to non-POSIX expressions. This patch should cover all occurrences in autoconf/automake and scripts using /bin/sh in their shebang.