[CMake] Patch to FindFreetype.cmake to avoid NOTFOUND in FREETYPE_LIBRARIES

[Rothganger, Fredrick]

Greetings,

Not sure how to address the following to the maintainer of FindFreetype, so sending it to this list...

FindFreetype unconditionally sets FREETYPE_LIBRARIES to whatever FREETYPE_LIBRARY is, even when it is not found.  Many other FindXXX modules wrap the creation of their XXX_LIBRARIES variable in an IF(XXX_FOUND) block.  This reduces the complexity of specifying which libraries to link a target against when that list contains optional libraries.  Attached is a patch that modifies FindFreetype to follow this convention as well.  Please consider making this change.

-- Fred

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