Unbreak openoffice-4 build with gcc 4.9

[truckman]

Summary

When building openoffice-4 with gcc 4.9, the build fails with
link errors because of some inline class methods that gcc
thinks are undefined. This only happens when the .o file are
compiled with -Os. Changing to -O0 fixes the problem

Test Plan

Build and run with both gcc 4.8 and gcc 4.9.

[truckman]

Closed by commit rP379055 (authored by @truckman).