Bug#612341: Add -dev package

[Mathieu Malaterre <malat@debian.org>]

It would be super nice of there was also a libjpeg-turbo-dev package
which would provide turbojpeg.h. This file is exepcted for some other
software, including virtuagl:


-- Found OpenGL: /usr/lib/libGL.so
-- Enabling X Video support
CMake Error at cmakescripts/FindTurboJPEG.cmake:23 (message):
  Could not find turbojpeg.h in /opt/libjpeg-turbo/include.  If it is
  installed in a different place, then set TJPEG_INCLUDE_DIR accordingly.
Call Stack (most recent call first):
  CMakeLists.txt:255 (include)


-- Configuring incomplete, errors occurred!
make[1]: *** [override_dh_auto_configure] Error 1
make[1]: Leaving directory `/tmp/virtualgl-2.3.1'


where:

$ cat cmakescripts/FindTurboJPEG.cmake
...
check_c_source_compiles("#include <turbojpeg.h>\nint main(void) {
tjhandle h=tjInitCompress(); return 0; }" TURBOJPEG_WORKS)


thanks