installer: remove support for FILE_CAN_MISS style

The idea appears fundamentally error prone, and is unused.

Change-Id: I65e1c5b80d7101b8ba37c213fcb787d31e3b9d1d

solenv/bin/modules/installer/scriptitems.pm

@@ -1062,7 +1062,6 @@ sub get_Source_Directory_For_Files_From_Includepathlist
         my $styles = "";
         my $file_can_miss = 0;
         if ( $onefile->{'Styles'} ) { $styles = $onefile->{'Styles'}; }
-        if ( $styles =~ /\bFILE_CAN_MISS\b/ ) { $file_can_miss = 1; }
 
         if (( $installer::globals::languagepack ) && ( ! $onefile->{'ismultilingual'} ) && ( ! ( $styles =~ /\bFORCELANGUAGEPACK\b/ ))) { $file_can_miss = 1; }
         if (( $installer::globals::helppack ) && ( ! $onefile->{'ismultilingual'} ) && ( ! ( $styles =~ /\bFORCEHELPPACK\b/ ))) { $file_can_miss = 1; }

solenv/bin/modules/installer/worker.pm

@@ -513,10 +513,6 @@ sub put_scpactions_into_installset
         my $sourcefile = $onescpaction->{'sourcepath'};
         my $destfile = $destdir . $installer::globals::separator . $onescpaction->{'DestinationName'};
 
-        my $styles = "";
-        if ( $onescpaction->{'Styles'} ) { $styles = $onescpaction->{'Styles'}; }
-        if (( $styles =~ /\bFILE_CAN_MISS\b/ ) && ( $sourcefile eq "" )) { next; }
-
         if (( $subdir =~ /\// ) || ( $subdir =~ /\\/ ))
         {
             installer::systemactions::create_directory_structure($destdir);