[patch #10065] fix shell syntax in AX_JNI_INCLUDE_DIR

Follow-up Comment #1, patch #10065 (project autoconf-archive):

On investigating further, the single brackets are actually ok. It's just that
$macos_version is an empty string because the parsing magic before that didn't
work (sw_vers is 11.3 here, but the sed command looks for some x.y.z; further,
it would then set macos_version=y, which was ok when the macOS version was
10.y.z).

Still might make sense to apply the patch and switch to use `test`.

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