Trim down excelsior-gui's dependencies

- Remove glmark2 and many related dev header packages from the
requirements of excelsior-gui. They can always be installed separately,
if needed.

Change-Id: I2b86231bb766239f402de8d391df04f59063a0ec
2 files changed
tree: d0adfddbf6569b31b8f2adb13ff46f6b725bfe23
  1. debian/