bugfix: osproc compiles under windows again

koch.nim

@@ -124,8 +124,8 @@ proc bootIteration(args: string): bool =
   exec "rod" / "nimrod1 cc $# $# rod/nimrod.nim" % [bootOptions, args]
   # Nimrod does not produce an executable again if nothing changed. That's ok:
   result = sameFileContent("rod" / "nimrod".exe, nimrod1)
-  safeRemove("bin" / "nimrod".exe)
   var dest = "bin" / "nimrod".exe
+  safeRemove(dest)
   copyFile(dest=dest, source="rod" / "nimrod".exe)
   inclFilePermissions(dest, {fpUserExec})
   safeRemove(nimrod1)

lib/pure/osproc.nim

@@ -319,7 +319,7 @@ when defined(Windows) and not defined(useNimRtl):
       result.errorHandle = si.hStdError
 
     var cmdl: cstring
-    if false: # poUseShell in options:
+    when false: # poUseShell in options:
       cmdl = buildCommandLine(getEnv("COMSPEC"), @["/c", command] & args)
     else:
       cmdl = buildCommandLine(command, args)