Remove spurious extern.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90937 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Unix/Path.inc b/lib/System/Unix/Path.inc
index ff1497a..33b26f7 100644
--- a/lib/System/Unix/Path.inc
+++ b/lib/System/Unix/Path.inc
@@ -77,7 +77,7 @@
 namespace llvm {
 using namespace sys;
 
-extern const char sys::PathSeparator = ':';
+const char sys::PathSeparator = ':';
 
 Path::Path(const std::string& p)
   : path(p) {}