Fix datarootdir for snap (Issue #545)

Author: michaelrsweet

snap/snapcraft.yaml

@@ -30,7 +30,7 @@ apps:
 parts:
  main:
  plugin: autotools
- autotools-configure-parameters: [--prefix=/]
+ autotools-configure-parameters: [--prefix=/ --datarootdir=/share]
  source: .
  build-packages: [build-essential, pkg-config, libfltk1.3-dev, libcups2-dev, libjpeg-turbo8-dev, libpng-dev, zlib1g-dev]
  stage-packages: [libfltk-images1.3, libfltk1.3, libfontconfig1, libfreetype6, libjpeg-turbo8, libpng16-16, libx11-6, libxau6, libxcb1, libxcursor1, libxdmcp6, libxext6, libxfixes3, libxft2, libxinerama1, libxrender1]