fontconfig: Fix for Linuxbrew
fontconfig: Fix for Linuxbrew

Fix conflicting types for FCObjectTypeHash when built with gperf 3.1 or newer.
See https://bugzilla.freedesktop.org/show_bug.cgi?id=101280

Signed-off-by: Bob W. Hogg <c772a964fd55352a3510e5d535dd9ccc9ac30168@linux.com>

LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,Linuxbrew/homebrew-core