kotest fix for mips

At the same time it does for named literals:
        .type   fmt_msg, @object
        .size   fmt_msg, 15
fmt_msg:
        .ascii  "enter with %d\012\000"



I am too lazy to investigate which ancient specification from past century it follows. Fortunately this is easy repairable problem - just calculate size of symbol as distance to next one (or till end of section). Since I suspect that this is not the only architecture with similar gcc behavior, I add -f option to do such kind of sizes recalculation

Some results for mips32 kernel 6.0:
find ~/linux60/ -type f -name "*.ko" | xargs ./kotest | awk -f total.awk
1890293
1497092

potential memory savings is almost 1.9Mb from moving string literals used only in .init.text + yet almost 1.5Mb from unloading some unnecessary sections