Remove the conditional that avoided passing the Objective-C runtime...

Remove the conditional that avoided passing the Objective-C runtime specification flags to cc1.  This fixes PR10369 (__builtin_NSStringMakeConstantString() selecting the wrong runtime in C / C++ code and crashing, although it doesn't fix the problem that instantiating the Mac runtime for non-Darwin targets was crashing.) 

llvm-svn: 140853