Fix of "no support generated" https://github.com/prusa3d/Slic3r/issues/114

when a first layer height was set in percents.

xs/src/libslic3r/SupportMaterial.hpp

@@ -127,10 +127,6 @@ public:
 public:
 	PrintObjectSupportMaterial(const PrintObject *object, const SlicingParameters &slicing_params);
 
-	// Height of the 1st layer is user configured as it is important for the print
-	// to stick to he print bed.
-	coordf_t	first_layer_height() 		const { return m_object_config->first_layer_height.value; }
-
 	// Is raft enabled?
 	bool 		has_raft() 					const { return m_slicing_params.has_raft(); }
 	// Has any support?