simpleperf: fix binary_cache_builder.py.

libc.so/libart.so on device has .symtab but not .debug_line. In this
case, we still want to replace it with the unstripped binary.

Bug: none
Test: run test.py.
Change-Id: I0308e7fafe1f41c2e57870cf72355dc8151ed9fd
3 files changed