The explicit limit is dropped, which means that we return to the kernel default of 50% of RAM. See362a55fc14for a discussion why that is not as much as it seems. It turns out various applications need more space in /dev/shm and we would break them by imposing a low limit. While at it, rename the define and use a single macro for various tmpfs mounts. We don't really care what the purpose of the given tmpfs is, so it seems reasonable to use a single macro. This effectively reverts part of7d85383edb. Fixes #16617.
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