fix static extension

Author: Ivansete-status

waku.nimble

@@ -71,7 +71,7 @@ proc buildLibrary(lib_name: string, srcDir = "./", params = "", `type` = "static
     extra_params &= " " & paramStr(i)
   if `type` == "static":
     exec "nim c" & " --out:build/" & lib_name &
-      ".a --threads:on --app:staticlib --opt:size --noMain --mm:refc --header -d:metrics --nimMainPrefix:libwaku --skipParentCfg:on -d:discv5_protocol_id=d5waku " &
+      " --threads:on --app:staticlib --opt:size --noMain --mm:refc --header -d:metrics --nimMainPrefix:libwaku --skipParentCfg:on -d:discv5_protocol_id=d5waku " &
       extra_params & " " & srcDir & "libwaku.nim"
   else:
     exec "nim c" & " --out:build/" & lib_name &