All the makefiles should honor {{{PROF_FLAGS}}}.   Make db-benchmark-test statically linkable by removing the conflict with {{{toku_fill_dbt}}}.  Although gprof still doesn't work with dynamically linked libraries, we can statically link it and get useful info.  Closes #515.

git-svn-id: file:///svn/tokudb@2755 c7de825b-a66e-492c-adef-691d508d4ae1