microbenchmarks: Update common.mk with symbolic and visibility flags This syncs common.mk with the latest source in src/platform2/common-mk. Main change that affects the compiled binary are the newly added -fvisibility-inlines-hidden CXXFLAGS and the -Bsymbolic-non-weak LDFLAGS (see comments in the file for what these do). BUG=b:352469414 TEST=CQ Change-Id: I90146ff2e4fdae8b71dfad2e404d9c94766feab3 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/microbenchmarks/+/5693248 Auto-Submit: Tatsuyuki Ishi <[email protected]> Tested-by: Tatsuyuki Ishi <[email protected]> Commit-Queue: Tatsuyuki Ishi <[email protected]> Reviewed-by: Vovo Yang <[email protected]>