Fix redefinition of module build error for xcframeworks with module maps

Fixes a redefinition of module 'X' build error that appeared in 4.201.0-rc.1 for targets depending on a precompiled xcframework that ships a module map. Tuist no longer adds such xcframework slice headers to the header search path, because Xcode’s ProcessXCFramework already exposes the matching headers through $(BUILT_PRODUCTS_DIR)/include. xcframeworks without module maps, including cached Swift/library products, keep getting their headers added as before.