Change upstream cmake behaviour.
Forward: no, keeping this patch downstrem.
--- a/lib/THNN/CMakeLists.txt
+++ b/lib/THNN/CMakeLists.txt
@@ -1,10 +1,6 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 2.6 FATAL_ERROR)
 CMAKE_POLICY(VERSION 2.6)
 
-IF(NOT Torch_FOUND)
-  FIND_PACKAGE(Torch REQUIRED)
-ENDIF()
-
 IF(NOT THNN_INSTALL_LIB_SUBDIR)
   SET(THNN_INSTALL_LIB_SUBDIR "lib" CACHE PATH "THNN install library directory")
 ENDIF()
