backtrace: trim of unneeded slash from solib

Previously we would output solib with an unnecessary slash:

  native: art::JDWP::JdwpState::Run()+6018 [0x416bf3e3] (/libart.so)

Trim it off so it omits the slash:

  native: art::JDWP::JdwpState::Run()+6018 [0x41961f6b] (libart.so)

Change-Id: I82baf1e624227858f5750ef57058474d21777451
1 file changed