Fix Windows curl/nghttp2 static build

When curl is linked with a static nghttp2, NGHTTP2_STATICLIB
must be defined.

ports/curl/0004_nghttp2_staticlib.patch

@@ -0,0 +1,14 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 490cc19..51c0a92 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -388,6 +388,9 @@ if(USE_NGHTTP2)
+   find_package(NGHTTP2 REQUIRED)
+   include_directories(${NGHTTP2_INCLUDE_DIRS})
+   list(APPEND CURL_LIBS ${NGHTTP2_LIBRARIES})
++  if(CURL_STATICLIB)
++    add_definitions(-DNGHTTP2_STATICLIB)
++  endif()
+ endif()
+
+ if(NOT CURL_DISABLE_LDAP)

ports/curl/portfile.cmake

@@ -13,6 +13,7 @@ vcpkg_apply_patches(
         ${CMAKE_CURRENT_LIST_DIR}/0001_cmake.patch
         ${CMAKE_CURRENT_LIST_DIR}/0002_fix_uwp.patch
         ${CMAKE_CURRENT_LIST_DIR}/0003_fix_libraries.patch
+        ${CMAKE_CURRENT_LIST_DIR}/0004_nghttp2_staticlib.patch
 )
 
 string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "static" CURL_STATICLIB)