installer: exit on the other errors in resolve_filelist_flag too

Nobody reads these error messages if the build succeeds.

Change-Id: Ib1e52bf188d0da2bc35a0d2d2f79fff409e15977
Reviewed-on: https://gerrit.libreoffice.org/57270
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

solenv/bin/modules/installer/filelists.pm

@@ -53,6 +53,7 @@ sub resolve_filelist_flag
                     if ((index $path, $outdir) != 0)
                     {
                         installer::logger::print_error("file '$path' is not in '$outdir'");
+                        $error = 1;
                     }
                     if ($path =~ '\/\/')
                     {
@@ -68,6 +69,7 @@ sub resolve_filelist_flag
                         if (!-e $path)
                         {
                             installer::logger::print_error("file '$path' does not exist");
+                            $error = 1;
                         }
                     }