Fixes bug #609850 - tracker-store segfault in...
Fixes bug #609850 - tracker-store segfault in...

unac_string() was passing integers as size_t, corrupting
memory. Now strip_word() mimics unac_string() avoiding such
issue.

outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker