Generate Debug Symbols turned off

```
What steps will reproduce the problem?
1. Run cmake using the ios toolchain, open the xcodeproject

What is the expected output?
Generate Debug Symbols should be "Yes" for "Debug" and "RelWithDebInfo", and
otherwise "No"

What do you see instead?
It is always set to "No"

Please provide any additional information below.
To solve this, removing the following lines from iOS.cmake works for me:

# Force the compilers to gcc for iOS
include (CMakeForceCompiler)
CMAKE_FORCE_C_COMPILER (/usr/bin/clang Apple)
CMAKE_FORCE_CXX_COMPILER (/usr/bin/clang++ Apple)
set(CMAKE_AR ar CACHE FILEPATH "" FORCE)

```

Original issue reported on code.google.com by `jan.rue...@dacuda.com` on 4 Aug 2014 at 1:54