compiler: bug: end instruction balance in tjmp/bjmp handling.

I was reading the compiler code and noticed that the code
template for unwind protect has two end instructions: one
for the protected calculation and one for the unwinds.

* stdlib/compiler.tl (convert-t-b-jumps): When a uwprot
instruction is encountered, the balance must be incremented
by 2, in order to skip past two end instructions. Without
this we will end up with incorrect code for a block return
that jumps out of a block, in which there is a subsequent
unwind-protect.

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