[vtkusers] Use of system freetype library fails for Linux compilation

[Cesar Rabak]

On Linux kernel 2.6.11, XFree 4.4.0, gcc 3.3.3,
freetype lib version 2.1.4, an attempt to build VTK
(CVS Tag D2005.06.19.03.00.00) using the system
library fails due the name of the functions have
different spelling.

E.g.: 

FTC_Manager_LookupFace versus FTC_Manager_Lookup_Face
FTC_Manager_LookupSize versus FTC_Manager_Lookup_Size

--
Cesar Rabak

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