Windows: Generate import libraries for private ntdll and wow64 APIs

The MinGW supplied import libraries are incomplete and miss a lot of
functions necessary to implement lower level windows code. To avoid
needing to many resolve every function, pull in .def files from wine
that detail the entire ntdll and wow64 APIs.

Source/CMakeLists.txt

@@ -1,2 +1,6 @@
 add_subdirectory(Common/)
 add_subdirectory(Tools/)
+
+if (MINGW_BUILD)
+  add_subdirectory(Windows/)
+endif()

Source/Windows/CMakeLists.txt

@@ -0,0 +1,15 @@
+function(build_implib name)
+  add_custom_target(${name}lib ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/lib${name}.a)
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/lib${name}.a
+    COMMAND ${CMAKE_DLLTOOL} -d ${CMAKE_CURRENT_SOURCE_DIR}/Defs/${name}.def -k -l lib${name}.a
+    COMMENT "Building lib${name}.a"
+  )
+
+  add_library(${name} SHARED IMPORTED)
+  set_property(TARGET ${name} PROPERTY IMPORTED_IMPLIB ${CMAKE_CURRENT_BINARY_DIR}/lib${name}.a)
+  add_dependencies(${name} ${name}lib)
+endfunction()
+
+build_implib(ntdll)
+build_implib(wow64)

Source/Windows/Defs/wow64.def

@@ -0,0 +1,33 @@
+; File generated automatically from wine/dlls/wow64/wow64.spec; do not edit!
+; To generate: winebuild --def -E wine/dlls/wow64/wow64.spec > wow64.def
+
+LIBRARY wow64.dll
+
+EXPORTS
+  Wow64AllocThreadHeap @1 PRIVATE
+  Wow64AllocateHeap @2 PRIVATE
+  Wow64AllocateTemp @3
+  Wow64ApcRoutine @4
+  Wow64CheckIfNXEnabled @5 PRIVATE
+  Wow64EmulateAtlThunk @6 PRIVATE
+  Wow64FreeHeap @7 PRIVATE
+  Wow64FreeThreadHeap @8 PRIVATE
+  Wow64GetWow64ImageOption @9 PRIVATE
+  Wow64IsControlFlowGuardEnforced @10 PRIVATE
+  Wow64IsStackExtentsCheckEnforced @11 PRIVATE
+  Wow64KiUserCallbackDispatcher @12
+  Wow64LdrpInitialize @13
+  Wow64LogPrint @14 PRIVATE
+  Wow64NotifyUnsimulateComplete @15 PRIVATE
+  Wow64PassExceptionToGuest @16
+  Wow64PrepareForDebuggerAttach @17 PRIVATE
+  Wow64PrepareForException @18
+  Wow64RaiseException @19
+  Wow64ShallowThunkAllocObjectAttributes32TO64_FNC @20 PRIVATE
+  Wow64ShallowThunkAllocSecurityQualityOfService32TO64_FNC @21 PRIVATE
+  Wow64ShallowThunkSIZE_T32TO64 @22 PRIVATE
+  Wow64ShallowThunkSIZE_T64TO32 @23 PRIVATE
+  Wow64SuspendLocalThread @24
+  Wow64SystemServiceEx @25
+  Wow64ValidateUserCallTarget @26 PRIVATE
+  Wow64ValidateUserCallTargetFilter @27 PRIVATE