Ignore backup files
Do not hardcode qmake executable, it should be found by the CMake itself.
Find the include directory for libunwind.h.

This allows finding libunwind that has been installed in a non-standard location
just by setting CMAKE_PREFIX_PATH.
Fix some missing libraries.
Make building of OpenGL tests and samples optional.
Add missing X11 libs
Merge pull request #7 from Daft-Freak/patch-1

Add missing X11 libs
Merge pull request #8 from Daft-Freak/patch-2

Ignore backup files
Merge branch 'master' of https://github.com/stativ/vogl into stativ-master

Conflicts:
	src/vogleditor/CMakeLists.txt
cmake: Use CMAKE_DL_LIBS instead of hardcoding "dl"
cmake: Use find_package to find X11 libraries
cmake: Use find_package to find pthreads
vogleditor: Cleanup cmake libraries

pthread is not directly used here (used by voglcore), so no need to
specify it here. X11 is duplicated.