Disable automatic resource initializers when building static.

That's done manually, and when such a static lib is linked to a DLL, the
suddenly appearing global constructors are unexpected.

src/Magnum/DebugTools/CMakeLists.txt

@@ -51,6 +51,14 @@ if(TARGET_GL)
     if(MAGNUM_TARGET_GLES AND NOT MAGNUM_TARGET_GLES2)
         corrade_add_resource(MagnumDebugTools_RESOURCES resources.conf)
         list(APPEND MagnumDebugTools_SRCS ${MagnumDebugTools_RESOURCES})
+        if(BUILD_STATIC)
+            # On the static build we're importing the resources manually, so no
+            # need to have the implicit initializers as well.
+            set_property(SOURCE ${MagnumDebugTools_RESOURCES} APPEND PROPERTY
+                COMPILE_DEFINITIONS
+                    "CORRADE_AUTOMATIC_INITIALIZER=CORRADE_NOOP"
+                    "CORRADE_AUTOMATIC_FINALIZER=CORRADE_NOOP")
+        endif()
     endif()
 
     if(NOT MAGNUM_TARGET_WEBGL)

src/Magnum/Shaders/CMakeLists.txt

@@ -63,6 +63,13 @@ set(MagnumShaders_PRIVATE_HEADERS Implementation/CreateCompatibilityShader.h)
 add_library(MagnumShadersObjects OBJECT
     ${MagnumShaders_SRCS}
     ${MagnumShaders_HEADERS})
+if(BUILD_STATIC)
+    # On the static build we're importing the resources manually, so no need to
+    # have the implicit initializers as well.
+    set_property(SOURCE ${MagnumShaders_RCS} APPEND PROPERTY COMPILE_DEFINITIONS
+        "CORRADE_AUTOMATIC_INITIALIZER=CORRADE_NOOP"
+        "CORRADE_AUTOMATIC_FINALIZER=CORRADE_NOOP")
+endif()
 target_include_directories(MagnumShadersObjects PUBLIC
     $<TARGET_PROPERTY:Magnum,INTERFACE_INCLUDE_DIRECTORIES>
     $<TARGET_PROPERTY:MagnumGL,INTERFACE_INCLUDE_DIRECTORIES>)

src/Magnum/TextureTools/CMakeLists.txt

@@ -34,6 +34,14 @@ set(MagnumTextureTools_HEADERS
 if(TARGET_GL)
     corrade_add_resource(MagnumTextureTools_RCS resources.conf)
     set_target_properties(MagnumTextureTools_RCS-dependencies PROPERTIES FOLDER "Magnum/TextureTools")
+    if(BUILD_STATIC)
+        # On the static build we're importing the resources manually, so no
+        # need to have the implicit initializers as well.
+        set_property(SOURCE ${MagnumTextureTools_RCS} APPEND PROPERTY
+            COMPILE_DEFINITIONS
+                "CORRADE_AUTOMATIC_INITIALIZER=CORRADE_NOOP"
+                "CORRADE_AUTOMATIC_FINALIZER=CORRADE_NOOP")
+    endif()
 
     list(APPEND MagnumTextureTools_SRCS
         DistanceField.cpp