tomoyo-tools: pass correct libdir to make

Fix QA issue when enable multilib:
ERROR: QA Issue: tomoyo-tools: Files/directories were installed but not shipped in any package:
  /usr/lib
  /usr/lib/libtomoyotools.so.3.0.2
  /usr/lib/libtomoyotools.so.3
  /usr/lib/.debug
  /usr/lib/tomoyo
  /usr/lib/.debug/libtomoyotools.so.3.0.2
  /usr/lib/tomoyo/init_policy
  [snip]
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install.  [installed-vs-shipped]

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>