Minor cmake fixes

[jbeich]

All changes are independent. 3bcbc30 is for the following error:

$ cmake -DAQUARIA_INTERNAL_TINYXML2=off .
...
CMake Warning at CMakeLists.txt:230 (find_package):
  By not providing "FindTinyXML2.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "TinyXML2",
  but CMake did not find one.

  Could not find a package configuration file provided by "TinyXML2" with any
  of the following names:

    TinyXML2Config.cmake
    tinyxml2-config.cmake

  Add the installation prefix of "TinyXML2" to CMAKE_PREFIX_PATH or set
  "TinyXML2_DIR" to a directory containing one of the above files.  If
  "TinyXML2" provides a separate development package or SDK, be sure it has
  been installed.


-- Using internal copy of TinyXML2
...

[fgenesis]

Never had this on linux, but then again i only use bundled libs. Thanks!