PATCH: make __sf_fake_std{in,out,err} weak in impure.c

[Sandra Loosemore]

This patch fixes a problem I noted when building some test programs for a target 
board that has a very small amount of memory.  Even though the program did not 
use stdio features, the references to __sf_fake_std{in,out,err} in impure.c were 
causing the linker to suck in their definitions in findfp.o, along with all the 
other stuff in that file, which in turn sucked in _malloc_r.

-Sandra

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