Dynlib fix for status-go integration (#97)

* Dynlib fix as suggested in https://github.com/status-im/nim-confutils/issues/31

* Update confutils.nim

* Declare empty commandLineParams if the standard one is not declared.

---------

Co-authored-by: Jacek Sieka <arnetheduck@gmail.com>

confutils.nim

@@ -884,6 +884,12 @@ func constructEnvKey*(prefix: string, key: string): string {.raises: [].} =
   except ValueError as err:
     raiseAssert "strformat.`&` failed: " & err.msg
 
+# On Posix there is no portable way to get the command
+# line from a DLL and thus the proc isn't defined in this environment.
+# See https://nim-lang.org/docs/os.html#commandLineParams
+when not declared(commandLineParams):
+  proc commandLineParams(): seq[string] = discard
+ 
 proc loadImpl[C, SecondarySources](
     Configuration: typedesc[C],
     cmdLine = commandLineParams(),