fflush in src/list.c to make tested behavior consistent
On glibc, if output is redirected to a file, output will look like this: touch test/ok/gif touch test/ok/jpg touch test/ok/png touch test/ok/pnm test/ok/gif test/ok/jpg test/ok/png test/ok/pnm On musl, if stdout is redirected to a file, output looks like this: test/ok/gif touch test/ok/gif touch test/ok/jpg touch test/ok/png touch test/ok/pnm test/ok/jpg test/ok/png test/ok/pnm On glibc and musl, if stdout is interactive, it looks like this: test/ok/gif touch test/ok/gif test/ok/jpg touch test/ok/jpg test/ok/png touch test/ok/png test/ok/pnm touch test/ok/pnm Adding two fflush calls makes all behavior look like the last example. Test cases have been updated accordingly.
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