CMake: force static plugins on iOS and WinRT.

Not sure why this was not enabled for ages already.

CMakeLists.txt

@@ -193,6 +193,9 @@ cmake_dependent_option(WITH_OPENGLTESTER "Build OpenGLTester library" OFF "NOT B
 if(CORRADE_TARGET_EMSCRIPTEN OR CORRADE_TARGET_ANDROID)
     set(BUILD_STATIC ON)
     set(BUILD_PLUGINS_STATIC ON)
+# Dynamic plugins are not working on iOS or Windows RT at the moment
+elseif(CORRADE_TARGET_IOS OR CORRADE_TARGET_WINDOWS_RT)
+    set(BUILD_PLUGINS_STATIC ON)
 endif()
 
 if(BUILD_STATIC)

doc/building.dox

@@ -816,8 +816,8 @@ architectures in `CMAKE_OSX_ARCHITECTURES`. Be sure to set
 
 As every application is in its own sandbox, it doesn't make sense to build
 shared libraries (although it is supported). Enable `BUILD_STATIC` to build
-static libraries. You might also have problems using dynamic plugins, enable
-`BUILD_PLUGINS_STATIC` to build also plugins as static. OpenGL ES 2.0 is
+static libraries. Dynamically loaded plugins are not supported on iOS at the
+moment, thus `BUILD_PLUGINS_STATIC` is implicitly enabled. OpenGL ES 2.0 is
 enabled by default, switch to 3.0 by disabling `TARGET_GLES2`.
 
 Please note that `BUILD_MULTITHREADED` is supported only since Xcode 7.3 and

package/ci/appveyor-rt.bat

@@ -78,6 +78,5 @@ cmake .. ^
     -DTARGET_GLES2=%TARGET_GLES2% ^
     -DBUILD_TESTS=ON ^
     -DBUILD_STATIC=ON ^
-    -DBUILD_PLUGINS_STATIC=ON ^
     -G "%GENERATOR%" -A x64 || exit /b
 cmake --build . --config Release -- /m /v:m || exit /b

package/ci/travis-ios-simulator.sh

@@ -60,7 +60,6 @@ cmake .. \
     -DWITH_TGAIMPORTER=ON \
     -DWITH_WAVAUDIOIMPORTER=ON \
     -DBUILD_STATIC=ON \
-    -DBUILD_PLUGINS_STATIC=ON \
     -DBUILD_TESTS=ON \
     -DBUILD_GL_TESTS=ON \
     -G Xcode