Makefile.master: Prevent more GCC auto-inlining

In the same spirit as cw(1) passing -fno-inline-functions, we also need
to pass -fno-inline-small-functions and
-fno-inline-functions-called-once to newer GCC to prevent functions
which it deems to be "small enough", or functions only called once being
automatically inlined at most optimization levels.

(Un)fortunately the use of -fno-inline-small-functions bandaids a
problem during boot on amd64 where kcf`rndbytes_cnt would underflow, and
leave us scribbling over much of kernel memory eventually panicking most
often in clock() with cpu_list being garbage.

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