libclang: Mark clang_Cursor_isNull with CINDEX_LINKAGE to make it available on windows.
libclang: Mark clang_Cursor_isNull with CINDEX_LINKAGE to make it available on windows.

Patch by Timothy J Fontaine!

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@149533 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang