gtk+-native: fix relocation
gtk+-native: fix relocation

In a sysroot process hook, to deal with relocation:

  - Re-generate the gdk-pixbuf.loaders file to contain the current sysroot path
    to the pixbuf loaders directory.
  - Create wrappers for gdk-pixbuf-csource and gdk-pixbuf-query-loaders
    utilities, passing along the appropriate environment variables to ensure
    they too point at the current sysroot path.

Signed-off-by: Chris Larson <4c8c411260e601995081b113a5ef94a26eff2b25@mentor.com>

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