Fix test linking and static build on Windows.

I *love* this system and the amazing intricaties of dllexport/dllimport
attributes. Seventy new macros for all corner cases and ten new files
just to get this fucking thing right. It never gets old. Never. 99% of
the build system bureaucracy WOULD NOT BE NEEDED IF THAT THING HAD SANE
DESIGN LIKE EVERYWHERE ELSE. GAAAAH. AAAAAAAAARGH.

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.h

@@ -31,6 +31,8 @@
 
 #include <Magnum/Trade/AbstractImporter.h>
 
+#include "MagnumPlugins/AnyImageImporter/configure.h"
+
 #ifndef DOXYGEN_GENERATING_OUTPUT
 #ifndef MAGNUM_ANYIMAGEIMPORTER_BUILD_STATIC
     #if defined(AnyImageImporter_EXPORTS) || defined(AnyImageImporterObjects_EXPORTS)

src/MagnumPlugins/AnyImageImporter/CMakeLists.txt

@@ -23,6 +23,13 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(BUILD_STATIC)
+    set(MAGNUM_ANYIMAGEIMPORTER_BUILD_STATIC 1)
+endif()
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/configure.h.cmake
+               ${CMAKE_CURRENT_BINARY_DIR}/configure.h)
+
 set(AnyImageImporter_SRCS
     AnyImageImporter.cpp)
 
@@ -50,6 +57,7 @@ endif()
 target_link_libraries(AnyImageImporter ${MAGNUM_LIBRARIES})
 
 install(FILES ${AnyImageImporter_HEADERS} DESTINATION ${MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR}/AnyImageImporter)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/configure.h DESTINATION ${MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR}/AnyImageImporter)
 
 if(BUILD_TESTS)
     add_library(MagnumAnyImageImporterTestLib STATIC $<TARGET_OBJECTS:AnyImageImporterObjects>)

src/MagnumPlugins/AnyImageImporter/configure.h.cmake

@@ -0,0 +1,26 @@
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013, 2014, 2015
+              Vladimír Vondruš <mosra@centrum.cz>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+#cmakedefine MAGNUM_ANYIMAGEIMPORTER_BUILD_STATIC