Contain retained vendor source bundle

CMakeLists.txt

@@ -221,6 +221,30 @@ endif()
 
 if(PP_BUILD_APP)
     if(WIN32)
+        add_library(pp_legacy_vendor OBJECT
+            ${PP_VENDOR_SOURCES})
+        target_link_libraries(pp_legacy_vendor
+            PUBLIC
+                pp_project_options
+            PRIVATE
+                pp_project_warnings)
+        target_include_directories(pp_legacy_vendor
+            PUBLIC
+                ${PP_LEGACY_INCLUDE_DIRS})
+        target_compile_definitions(pp_legacy_vendor
+            PUBLIC
+                ENUM_BITFIELDS_NOT_SUPPORTED
+                UNICODE
+                _UNICODE
+                _CRT_SECURE_NO_WARNINGS
+                _SCL_SECURE_NO_WARNINGS
+                _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
+                _SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING
+                _CONSOLE
+                WITH_CURL=1)
+        set_target_properties(pp_legacy_vendor PROPERTIES
+            VS_GLOBAL_CharacterSet "Unicode")
+
         add_library(pp_legacy_renderer_gl OBJECT
             ${PP_LEGACY_RENDERER_GL_SOURCES})
         target_link_libraries(pp_legacy_renderer_gl
@@ -253,7 +277,7 @@ if(PP_BUILD_APP)
         add_library(pp_legacy_engine STATIC
             ${PP_LEGACY_ENGINE_SOURCES}
             $<TARGET_OBJECTS:pp_legacy_renderer_gl>
-            ${PP_VENDOR_SOURCES})
+            $<TARGET_OBJECTS:pp_legacy_vendor>)
 
         target_link_libraries(pp_legacy_engine
             PUBLIC
@@ -284,9 +308,6 @@ if(PP_BUILD_APP)
             VS_GLOBAL_CharacterSet "Unicode")
 
         target_precompile_headers(pp_legacy_engine PRIVATE src/pch.h)
-        set_source_files_properties(${PP_VENDOR_SOURCES}
-            PROPERTIES SKIP_PRECOMPILE_HEADERS ON)
-
         add_library(pp_legacy_app STATIC
             ${PP_LEGACY_APP_SOURCES})