tests: look for sRGB.icc in several paths, skip related tests if not found

1 changed files with 1 additions and 0 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -13,6 +13,7 @@ matrix:
            - netpbm
            - ghostscript
            - mupdf-tools
+            - icc-profiles-free
    - name: "python 3.9 Windows"
      os: windows
      language: shell       # 'language: python' is an error on Travis CI Windows