Add LookupAttachment signature for ND (#1942)

Adds the LookupAttachment signature for Nuclear Dawn

(cherry picked from commit a9a1939f75)

gamedata/sdktools.games/game.nucleardawn.txt

@@ -101,6 +101,21 @@
 		}
 	}
 	
+	/* CBaseAnimating::LookupAttachment */
+        "#default"
+        {
+                "Signatures"
+                {
+                        "LookupAttachment"
+                        {
+                                "library"       "server"
+				"windows"       "\x55\x8B\xEC\x56\x8B\xF1\x83\xBE\x2A\x2A\x2A\x2A\x00\x75\x2A\xE8\x2A\x2A\x2A\x2A\x85\xC0\x74\x2A\x8B\xCE\xE8\x2A\x2A\x2A\x2A\x8B\x86\x2A\x2A\x2A\x2A\x5E\x85\xC0\x74\x2A\x83\x38\x00\x74\x2A\xFF\x75"
+                                "linux"         "@_ZN14CBaseAnimating16LookupAttachmentEPKc"
+                                "mac"           "@_ZN14CBaseAnimating16LookupAttachmentEPKc"
+                        }
+                }
+        }
+	
 	/* SetUserInfo data */
 	"#default"
 	{