[Fontconfig] patch to improve FcConfigNormalizeFontDir ()

[Mike FABIAN]

Patch by Takashi IWAI <tiwai at suse.de> (CC:):

If FcConfigNormalizeFontDir () was called with a directory
which is not a subdirectory of a directory from a .conf file,
the list of all subdirectories was added to the list of known
directories. When doing this again, the list of subdirectories
was added again. Takashi's patch fixes this.

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-- 
Mike FABIAN   <mfabian at suse.de>   http://www.suse.de/~mfabian
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