Make libbcc public.

This commit is not expected to change any functionality.
diff --git a/lib/ExecutionEngine/SymbolResolverProxy.cpp b/lib/ExecutionEngine/SymbolResolverProxy.cpp
index 29929d9..5f3e7dc 100644
--- a/lib/ExecutionEngine/SymbolResolverProxy.cpp
+++ b/lib/ExecutionEngine/SymbolResolverProxy.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "SymbolResolverProxy.h"
+#include "bcc/ExecutionEngine/SymbolResolverProxy.h"
 
 using namespace bcc;