Mono's mcs doesn't like the filealign parameter

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276728 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/dotnet/CSharp.java

@@ -197,7 +197,7 @@ public class CSharp extends DotnetCompile {
      *@return    The OutputFile Parameter to CSC
      */
     protected String getFileAlignParameter() {
-        if (fileAlign != 0) {
+        if (fileAlign != 0 && !"mcs".equals(getExecutable())) {
             return "/filealign:" + fileAlign;
         } else {
             return null;