fix lmdb build

Author: matthewbastien

utils/build.ps1

@@ -2441,10 +2441,9 @@ function Test-Format {
 
 function Build-LMDB() {
   Build-CMakeProject `
-    -Action Build `
     -Src $SourceCache\swift-lmdb `
     -Bin (Get-HostProjectBinaryCache LMDB) `
-    -Arch $HostArch `
+    -Arch $Arch `
     -Platform Windows `
     -UseBuiltCompilers C `
     -BuildTargets default