i386 optimized string functions incorrectly treat size_t argument as ssize_t

[Mike Frysinger]

three of the i386 optimized asm functions (strncpy, strncat, strncmp) use the 
asm instruction 'js' to test the size_t __n argument.  since size_t is 
unsigned and js tests the sign bit, passing a value like (size_t)-1 will 
cause these functions to behave incorrectly.

for example, this simple test works with the C implementation, but fails with 
the asm version:
assert (strncmp("foo", "bar", (size_t)-1) != 0);

find attached a patch which should resolve the issue by utilizing 'jz' (plus a 
trick) instead of 'js'
-mike
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