mttools: 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: I4785a78a52da99deac49a95a94ceaae93f8f707b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mttools/+/5693546
Tested-by: Tatsuyuki Ishi <[email protected]>
Auto-Submit: Tatsuyuki Ishi <[email protected]>
Reviewed-by: Sean O'Brien <[email protected]>
Commit-Queue: Tatsuyuki Ishi <[email protected]>
Reviewed-by: Kyle Williams <[email protected]>
1 file changed