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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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.