plug-ins: lookup WMF fonts on same prefix when relocatable bundle.
When ENABLE_RELOCATABLE_RESOURCES is set, override libwmf fontdir. This is actually an alternate version of MR !9 by Alex Samorukov assuming a bundled GIMP on a single prefix rather than depending on an environment variable. This especially makes the relocatable feature more discoverable (rather than some random environment variable for which you'd need to read the code to discover it then make some wrapper script for GIMP).
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