$NetBSD$

If this check isn't disabled configure stops working.

--- externals/dynarmic/CMakeLists.txt.orig	2017-12-12 15:22:23.000000000 +0000
+++ externals/dynarmic/CMakeLists.txt
@@ -28,13 +28,6 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 # Warn on CMake API deprecations
 set(CMAKE_WARN_DEPRECATED ON)
 
-# Disable in-source builds
-set(CMAKE_DISABLE_SOURCE_CHANGES ON)
-set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
-if ("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
-    message(SEND_ERROR "In-source builds are not allowed.")
-endif()
-
 # Add the module directory to the list of paths
 list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/CMakeModules")