Merge pull request leetal#17 from MSNexploder/arm64e-support

Support arm64e (A12 and beyond)

Update ios.toolchain.cmake

Fixed double outputs if manually specifying CMAKE_OSX_SYSROOT

Update ios.toolchain.cmake

Added fix if upgrading Xcode versions on consequent builds

Merge pull request leetal#4 from leetal/new_version

Better compatibility. Possibility to expose symbols (especially useful in shared libraries)

Update CMakeLists.txt

Update the outdated example CMakeLists.txt in the example-lib

Merge branch 'master' of https://github.com/leetal/ios-cmake