Add libyuv (#5623)

* Add libyuv

* Only use libyuv on Android

Co-authored-by: Marshall Mohror <mohror64@gmail.com>

.gitmodules

@@ -52,3 +52,6 @@
 [submodule "zstd"]
     path = externals/zstd
     url = https://github.com/facebook/zstd.git
+[submodule "libyuv"]
+    path = externals/libyuv
+    url = https://github.com/lemenkov/libyuv.git

externals/CMakeLists.txt

@@ -129,3 +129,10 @@ endif()
 
 # lodepng
 add_subdirectory(lodepng)
+
+# (xperia64): Only use libyuv on Android b/c of build issues on Windows and mandatory JPEG
+if(ANDROID)
+    # libyuv
+    add_subdirectory(libyuv)
+    target_include_directories(yuv INTERFACE ./libyuv/include)
+endif()