ls/stat-free-symlinks fails when host doesnt support stat() syscall

[Mike Frysinger]

the ls/stat-free-symlinks test does:
strace -qe stat ....
on some systems (like parisc/Linux), stat is not a valid system call and so 
the test just fails.

it could be fixed in a few ways.  have test-lib.sh check for stat like it does 
with unlink.  have stat-free-symlinks fall back to stat64() if stat() fails.  
not sure which you'd want to go.
-mike

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