Adding the proper #include <limits.h> for Linux when using
INT_MAX and/or UINT_MAX.

Fixed ShaderCore.cpp and preemptively fixed libGLESv3.cpp.

Change-Id: Iedd445157f3de8c08394e6d2c9f99539eb123845
Reviewed-on: https://swiftshader-review.googlesource.com/3933Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>