[gegl] tests: only include jpeg/tiff load tests when libjpeg/libtiff included in build. Fixes issue #260

[Øyvind "pippin" Kolås <ok src gnome org>]

commit be18a086cf67899863568526614e276893631590
Author: John Marshall <jtm home gmail com>
Date:   Fri Jan 29 22:54:24 2021 +0000

    tests: only include jpeg/tiff load tests when
    libjpeg/libtiff included in build. Fixes issue #260

 tests/compositions/meson.build | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/tests/compositions/meson.build b/tests/compositions/meson.build
index 0337a9b50..7f60180d1 100644
--- a/tests/compositions/meson.build
+++ b/tests/compositions/meson.build
@@ -54,19 +54,23 @@ endif
 
 composition_tests_without_opencl = [
   'color-reduction',
-  'jpg-load-datauri',
   'pnm-ascii-load',
   'pnm-raw-load',
   'rgbe-load',
   'rgbe-save',
   'shift',
   'stretch-contrast-hsv',
-  'tiff-load',
   'tile',
 ]
 if jasper.found()
   composition_tests_without_opencl += 'jp2-load'
 endif
+if libjpeg.found()
+  composition_tests_without_opencl += 'jpg-load-datauri'
+endif
+if libtiff.found()
+  composition_tests_without_opencl += 'tiff-load'
+endif
 
 # Timeout for tests that require extra time to run
 #   test-name : timeout <int>