Fix compiling on Xcode 6.0.1 - partially

I am not sure the _LZMA_UINT32_IS_ULONG is the proper fix for the situation - might be a 32bit/64bit mismatch.

I am however sure about the second commit - the fix for Xcode 6.0.1 crashing because of invalid source control specifications(there was an empty entry in the array found in .xccheckout file.