Comment 14 for bug 1869561

Extra testing, uploading the libreoffice package used by Debian to ppa gave a build with the same 'no obvious way to instantiate implementation' warnings which aren't in Debian (but the build failed on a nospace error so it doesn't tell us if the resulting config was really buggy :-)

Other random change tried in case it worked but it didn't make a difference
export DEB_LDFLAGS_MAINT_STRIP := -Wl,-Bsymbolic-functions
in debian rules

(since that toolchain option is specific to Ubuntu and has been created issue for other packages in the past)