games-fps/gzdoom: included a file from base gentoo repo because i forgot

those weren't automatically included

games-fps/gzdoom/files/gzdoom-4.7.1-Introduce-the-BUILD_NONFREE-option.patch

@@ -0,0 +1,36 @@
+From d164cfcde29980c23ece15f0be1b09dac5853843 Mon Sep 17 00:00:00 2001
+From: William Breathitt Gray <vilhelm.gray@gmail.com>
+Date: Sat, 31 Aug 2019 21:23:23 +0900
+Subject: [PATCH] Introduce the BUILD_NONFREE option
+
+This allow users to disable building nonfree components (brightmaps.pk3,
+game_support.pk3, and game_widescreen_gfx.pk3) if they so desire.
+---
+ CMakeLists.txt | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 9013d8921..77bd703b1 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -411,11 +411,14 @@ add_subdirectory( libraries/lzma )
+ add_subdirectory( tools )
+ add_subdirectory( libraries/gdtoa )
+ add_subdirectory( wadsrc )
+-add_subdirectory( wadsrc_bm )
+ add_subdirectory( wadsrc_lights )
+-add_subdirectory( wadsrc_extra )
+-add_subdirectory( wadsrc_widepix )
+ add_subdirectory( src )
++option (BUILD_NONFREE "Build nonfree components" ON)
++if( BUILD_NONFREE )
++       add_subdirectory( wadsrc_bm )
++       add_subdirectory( wadsrc_extra )
++       add_subdirectory( wadsrc_widepix )
++endif()
+ 
+ if( NOT CMAKE_CROSSCOMPILING )
+ 	export(TARGETS ${CROSS_EXPORTS} FILE "${CMAKE_BINARY_DIR}/ImportExecutables.cmake" )
+-- 
+2.33.1
+