automate codesign/zip for mac build, add xz dep

Add POST_BUILD commands on Mac to codesign the `.app` and make a zip
file from it.

Also add xz/liblzma dist to `tools/osx/builder` because something
apparently wants liblzma.

src/wx/CMakeLists.txt

@@ -533,7 +533,16 @@ if(APPLE)
     # but only in Release mode
     IF(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
         ADD_CUSTOM_COMMAND(TARGET visualboyadvance-m POST_BUILD
-            COMMAND ${CMAKE_SOURCE_DIR}/tools/osx/third_party_libs_tool "$<TARGET_FILE_DIR:visualboyadvance-m>/../..")
+            COMMAND ${CMAKE_SOURCE_DIR}/tools/osx/third_party_libs_tool ./visualboyadvance-m.app
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}")
+
+        ADD_CUSTOM_COMMAND(TARGET visualboyadvance-m POST_BUILD
+            COMMAND codesign -s "Developer ID Application" --deep ./visualboyadvance-m.app
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}")
+
+        ADD_CUSTOM_COMMAND(TARGET visualboyadvance-m POST_BUILD
+            COMMAND zip -9r ./visualboyadvance-m-Mac.zip ./visualboyadvance-m.app
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}")
     ENDIF()
 endif(APPLE)
 

tools/osx/builder

@@ -25,6 +25,7 @@ DISTS='
     sfml            https://www.sfml-dev.org/files/SFML-2.4.2-sources.zip                                       lib/libsfml-system-s.a
     wxwidgets       https://github.com/wxWidgets/wxWidgets/releases/download/v3.0.3/wxWidgets-3.0.3.tar.bz2     lib/libwx_baseu-3.0.a
     ffmpeg          http://ffmpeg.org/releases/ffmpeg-3.3.4.tar.xz                                              lib/libavformat.a
+    xz              https://tukaani.org/xz/xz-5.2.3.tar.xz                                                      lib/liblzma.a
 '
 
 CONFIGURE_ARGS="--disable-shared --enable-static --prefix=$BUILD_ROOT/root"