Option to allow for dynamic linking with VC++ Runtime (#60)

By default ICD loader will use static linking. However, you can specifiy
cmake parameter USE_DYNAMIC_VCXX_RUNTIME to switch to dynamic. For
example:
  cmake -DUSE_DYNAMIC_VCXX_RUNTIME=TRUE ..

Signed-off-by: Artur Harasimiuk <artur.harasimiuk@intel.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a271ea..68cc196 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -57,14 +57,16 @@
 
 if (WIN32)
     target_link_libraries (OpenCL cfgmgr32.lib)
-    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
-    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
-    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
-    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
-    string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
-    string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
-    string(REPLACE "/MDd" "/MTd" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
-    string(REPLACE "/MDd" "/MTd" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
+    if(NOT USE_DYNAMIC_VCXX_RUNTIME)
+        string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
+        string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
+        string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
+        string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
+        string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
+        string(REPLACE "/MD" "/MT" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
+        string(REPLACE "/MDd" "/MTd" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
+        string(REPLACE "/MDd" "/MTd" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
+    endif()
 else()
     if (APPLE)
         set_target_properties (OpenCL PROPERTIES LINK_FLAGS "-pthread")