[Libreoffice] [REVIEW][3-5] fdo#44219 RHEL-4 buildbot doesn't have FT_Library_SetLcdFilter

[Caolán McNamara]

So the support for setting it isn't compiled in, so the result when
deployed on a recent Ubuntu is that you get weird-ass lcdfilter colour
effects around letters.

Proposed fix is to hack in dlsyming FT_Library_SetLcdFilter (when dlsym
functions are available) as the fallback, which seems to work.

C.