DO NOT MERGE - Remove unnecessary windows prebuilts.

Bug: 14416410

We forgot to remove these after fixing a Windows compilation issue (that
necessitated prebuilts).

Change-Id: I576aba32eeaeca00b1bdf08d4279223ba2ff69f2
diff --git a/tools/windows/libLLVM.dll b/tools/windows/libLLVM.dll
deleted file mode 100755
index ee94221..0000000
--- a/tools/windows/libLLVM.dll
+++ /dev/null
Binary files differ
diff --git a/tools/windows/libclang.dll b/tools/windows/libclang.dll
deleted file mode 100755
index 2a0e491..0000000
--- a/tools/windows/libclang.dll
+++ /dev/null
Binary files differ