Add a script to configure build environment and run CMake when building with...

Add a script to configure build environment and run CMake when building with Microsoft SDK toolchain.

cmake/FindSetEnv.cmake

+# A CMake script to find SetEnv.cmd.
+
+find_program(WINSDK_SETENV NAMES SetEnv.cmd
+  PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Microsoft SDKs\\Windows;CurrentInstallFolder]/bin")
+if (WINSDK_SETENV AND PRINT_PATH)
+  execute_process(COMMAND ${CMAKE_COMMAND} -E echo "${WINSDK_SETENV}")
+endif ()

cmake/run-cmake.bat

+@echo on
+rem This scripts configures build environment and runs CMake.
+rem Use it instead of running CMake directly when building with
+rem the Microsoft SDK toolchain rather than Visual Studio.
+rem It is used in the same way as cmake, for example:
+rem
+rem   run-cmake -G "Visual Studio 10 Win64" .
+
+for /F "delims=" %%i IN ('cmake "-DPRINT_PATH=1" -P %~dp0/FindSetEnv.cmake') DO set setenv=%%i
+if NOT "%setenv%" == "" call "%setenv%"
+cmake %*