depstracker: fix objdump backend
It was incorrectly removing the trailing character wich is the last 'l' from 'libfoo.dll' as what we get from the output is: '\tDLL Name: libfoo.dll'
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It was incorrectly removing the trailing character wich is the last 'l' from 'libfoo.dll' as what we get from the output is: '\tDLL Name: libfoo.dll'