[LyX/master] Cmake export tests: Use absolute paths for subfiles inside the source dir

[Kornel Benko]

commit 50779dda7ace5a7c0cb5f22dc2b79a276ad51413
Author: Kornel Benko <kor...@lyx.org>
Date:   Sun Mar 31 11:34:14 2019 +0200

    Cmake export tests: Use absolute paths for subfiles inside the source dir
    
    The testfile is inside the build dir, so no relative path to the source dir
    should be alloved.
---
 development/autotests/useSystemFonts.pl |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/development/autotests/useSystemFonts.pl 
b/development/autotests/useSystemFonts.pl
index 12c9850..8beb94c 100644
--- a/development/autotests/useSystemFonts.pl
+++ b/development/autotests/useSystemFonts.pl
@@ -258,8 +258,10 @@ sub interpretedCopy($$$$)
            }
          }
        }
-       if ($foundrelative) {
+       if ($foundrelative && $rStatus->{"filetype"} ne "prefix_for_list") {
           # The result can be relative too
+          # but, since prefix_for_list does no copy, we have to use absolute 
paths
+          # to address files inside the source dir
           my @rel_list = ();
           for my $fr (@{$filelist}) {
             push(@rel_list, File::Spec->abs2rel($fr, $destdir));