cmake: add support for static build

CMakeLists.txt

@@ -10,7 +10,14 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib)
 
-set(Bluelib_STATIC TRUE)
+if (NOT IVY_STATIC)
+	set(IVY_STATIC 0)
+endif ()
+
+if (IVY_STATIC)
+	set(Bluelib_STATIC TRUE)
+endif ()
+
 find_package(Bluelib REQUIRED)
 
 add_subdirectory(common)