[llvm-c] Specify explicit namespace in LLVMLoadLibraryPermanently

Presence of using namespace llvm depended on several #ifdef's, and
this broke the build on mswin32.

llvm-svn: 194142
diff --git a/llvm/lib/Support/DynamicLibrary.cpp b/llvm/lib/Support/DynamicLibrary.cpp
index f58a1f1..3feb5ad 100644
--- a/llvm/lib/Support/DynamicLibrary.cpp
+++ b/llvm/lib/Support/DynamicLibrary.cpp
@@ -176,5 +176,5 @@
 //===----------------------------------------------------------------------===//
 
 LLVMBool LLVMLoadLibraryPermanently(const char* Filename) {
-  return sys::DynamicLibrary::LoadLibraryPermanently(Filename);
+  return llvm::sys::DynamicLibrary::LoadLibraryPermanently(Filename);
 }
\ No newline at end of file