refs #160, only enable install target by default if not subproject as documented

Author: gulrak

CMakeLists.txt

@@ -18,7 +18,7 @@ if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
 else()
     option(GHC_FILESYSTEM_BUILD_EXAMPLES "Build examples" OFF)
     option(GHC_FILESYSTEM_BUILD_TESTING "Enable tests" OFF)
-    option(GHC_FILESYSTEM_WITH_INSTALL "With install target" ON)
+    option(GHC_FILESYSTEM_WITH_INSTALL "With install target" OFF)
 endif()
 option(GHC_FILESYSTEM_BUILD_STD_TESTING "Enable STD tests" ${GHC_FILESYSTEM_BUILD_TESTING})
 if(NOT DEFINED GHC_FILESYSTEM_TEST_COMPILE_FEATURES)