installer: Replace $installer::globals::plat

Change-Id: I81076008a619063acadc328a4ae8caf27eb8fe50

solenv/bin/modules/installer/globals.pm

@@ -292,9 +292,7 @@ BEGIN
     @removedirs = ();
     @removefiletable = ();
 
-    $plat = $^O;
-
-    if ( $plat =~ /cygwin/i )
+    if ( $^O =~ /cygwin/i )
     {
         $zippath = "zip";                   # Has to be in the path: /usr/bin/zip
         $separator = "/";

solenv/bin/modules/installer/profiles.pm

@@ -207,7 +207,7 @@ sub create_profiles
         # Sorting the array @onefile
         my $onefileref = sorting_profile(\@onefile);
 
-        if ( $installer::globals::iswin && $installer::globals::plat =~ /cygwin/i)      # Windows line ends only for Cygwin
+        if ( $installer::globals::iswin && $^O =~ /cygwin/i)      # Windows line ends only for Cygwin
         {
             include_windows_lineends($onefileref);
         }