Use optional CFFI in the Lime tools

lime/system/System.hx

@@ -255,7 +255,11 @@ class System {
 		#end
 		
 		#if optional_cffi
+		if (library != "lime" || method != "neko_init") {
+			
 			lazy = true;
+			
+		}
 		#end
 		
 		if (disableCFFI) {
@@ -478,7 +482,9 @@ class System {
 		
 		if (!__loadedNekoAPI) {
 			
-			var init = load ("lime", "neko_init", 5, lazy);
+			try {
+				
+				var init = load ("lime", "neko_init", 5);
 				
 				if (init != null) {
 					
@@ -506,6 +512,16 @@ class System {
 				}
 				#end
 				
+			} catch (e:Dynamic) {
+				
+				if (!lazy) {
+					
+					throw ("Could not find NekoAPI interface.");
+					
+				}
+				
+			}
+			
 			__loadedNekoAPI = true;
 			
 		}

tools/tools.hxml

@@ -4,3 +4,4 @@
 -lib lime
 -lib format
 #-lib svg
+-D optional_cffi