CMake: UseAndroid can be included as an oneliner.

CMakeLists.txt

@@ -200,8 +200,7 @@ if(BUILD_TESTS)
     # that has builtin Android support -- Gradle uses 3.6 so this will nicely
     # work in both cases.
     if(CORRADE_TARGET_ANDROID AND CMAKE_ANDROID_NDK)
-        list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/toolchains/modules/")
+        include(${PROJECT_SOURCE_DIR}/toolchains/modules/UseAndroid.cmake)
-        include(UseAndroid)
     endif()
 endif()
 

doc/platforms-android.dox

@@ -215,16 +215,14 @@ Gradle.
     used for the final release builds.
 
 Download contents of the toolchains repository from https://github.com/mosra/toolchains
-or add it as a Git submodule, add its module path to `CMAKE_MODULE_PATH` and
+or add it as a Git submodule and include the `UseAndroid` module from there.
-include the `UseAndroid` module. Wrapping it in a check for presence of
+Wrapping it in a check for presence of `CMAKE_ANDROID_NDK` will make it
-`CMAKE_ANDROID_NDK` will make it possible to have the pure CMake and a Gradle
+possible to have the pure CMake and a Gradle build coexist --- because Gradle
-build coexist --- because Gradle internally uses CMake 3.6 which doesn't know
+internally uses CMake 3.6 which doesn't know about `CMAKE_ANDROID_NDK` yet.
-about `CMAKE_ANDROID_NDK` yet.
 
 @code{.cmake}
 if(CORRADE_TARGET_ANDROID AND CMAKE_ANDROID_NDK)
-    list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/toolchains/modules/")
+    include(${PROJECT_SOURCE_DIR}/toolchains/modules/UseAndroid.cmake)
-    include(UseAndroid)
 endif()
 @endcode