Static fields require an out-of-line definition. Fix DynamicLibrary for real.

llvm-svn: 137844
diff --git a/llvm/lib/Support/DynamicLibrary.cpp b/llvm/lib/Support/DynamicLibrary.cpp
index 63298b9..5ee6a82 100644
--- a/llvm/lib/Support/DynamicLibrary.cpp
+++ b/llvm/lib/Support/DynamicLibrary.cpp
@@ -50,6 +50,8 @@
   (*ExplicitSymbols)[symbolName] = symbolValue;
 }
 
+char llvm::sys::DynamicLibrary::Invalid = 0;
+
 #ifdef LLVM_ON_WIN32
 
 #include "Windows/DynamicLibrary.inc"