Regenerate Xcode projects.

Update the Xcode projects to include xh_simplebook.cpp, as well as
wxWebView related sources in the iPhone project.



git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77953 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix crash with newer OS X builds running on older.

Use built-in zlib sources instead of system zlib. Backport of trunk
r76382, r76383, and r76385.

Closes #16192.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77954 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775