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Otherwise cmake windows builds with the mingw compiler are broken.

 - Used cmake regex to strip out the /RTC1 flag used by MSVC debug builds, which conflicts with the -nodefaultlib and -noentry flags.

CMake 2.8.5 added the GNUInstallDirs module, which provides various
variables following the CMAKE_INSTALL_*DIR pattern to allow users a more
flexible installation setup and to provide sensible defaults while
respecting distribution specific install locations like lib64 for RPM
based linux distributions or debian multiarch tuples.

included using CMake.

DLL entry to avoid crashes.

Finish taking C runtime out of GLEW on Windows and remove no longer supported MX configurations from Visual Studio projects.

any issues with mixing compilers and library versions. The Visual Studio
Projects need some touching up to get all of the settings synced up for all
of the build variants.

For cmake 3.4 - link X11 libs for glewinfo and visualinfo unless not available, or GLEW_OSMESA mode.

Installs a config module if CMake verion >= 2.8.12.
The config-module creates the import library targets
built in the project (glew, glew_s, glewmx, glewmx_s)
but in accordance with the FindGLEW module shipped with
CMake, it also creates GLEW::GLEW and GLEW::GLEWMX.

GLEW::GLEW and GLEW::GLEWMX will be simply copies of
glew/glewmx or glew_s/glewmx_s. If both versions are
available they alias the shared versions.

The default behaviour can be changed either when installing
or when using the package:

- Set BUILD_SHARED_LIBS to OFF or ON when building and
  installing GLEW. This controls which libraries
  (shared or static) will be installed (and not which
  will be built).
- Set GLEW_USE_STATIC_LIBS to OFF or ON before calling
  `find_package(GLEW CONFIG REQUIRED)` to force
  the config-module to create GLEW::GLEW and GLEWMX
  as aliases to glew/glewmx or glew_s/glewmx_s

The script ./cmake-testbuild.sh is added to test the
CMake build and config-module. See instructions there.

Other tidy-up for Visual Studio quality of life.