use CMake's autoexport

ports/speex/CMakeLists.txt

@@ -1,10 +1,6 @@
 cmake_minimum_required (VERSION 3.8.0)
 project (libspeex C)
 
-if(BUILD_SHARED_LIBS)
-  message(FATAL_ERROR "This CMake buildsystem only supports static builds")
-endif()
-
 set(COMMON_INCLUDES ${PROJECT_BINARY_DIR}/include)
 
 option(USE_SSE  "USE_SSE  used Note: USE_SSE and FIXED_POINT are mutually exclusive." ON)
@@ -56,6 +52,7 @@ set(SRC
   "libspeex/vbr.c"
   "libspeex/vq.c"
   "libspeex/window.c"
+  "win32/libspeex.def"
 )
 
 add_library(libspeex ${SRC})

ports/speex/portfile.cmake

@@ -1,11 +1,5 @@
 include(vcpkg_common_functions)
 
-if (VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
-    message(STATUS "Speex doesn't support visibility on Win32 yet. Building static.")
-    message(STATUS "See https://github.com/xiph/speex/blob/master/win32/config.h for more")
-    set(VCPKG_LIBRARY_LINKAGE static)
-endif()
-
 vcpkg_from_github(
   OUT_SOURCE_PATH SOURCE_PATH
   REPO xiph/speex