proj_info().searchpath should not include PROJ_LIB path #1498
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... if the context search_paths is not empty
The logic used when actually searching for files is that if
the context search_paths are set, these completely override
the PROJ_LIB variable. So we should make proj_info().searchpath
correctly reflect this, and not include the PROJ_LIB path
in searchpath if the context has search_paths manually set.
Refs qgis/QGIS#30048