remove duplicated read_buffer functions

When you take a pointer to a function in C that function is going
to appear in full in the final binary. This means that there were
3 sections of the final binary with the exact same code.

You could argue that in very high performance programs having that
function closer to the current instruction when it is needed will
give a performance boost but there are so many other places to
gain more significant speed ups in vis before that would be
remotely relevant.

In fact, removing these allows the buffer_append call to inlined
so that buffer_insert can be hopped to directly instead of
including a useless hop in the middle.

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