Merge pull request #3186 from lionleaf/makefile_opencv_imgcodecs

Add opencv_imgcodecs to library path in Makefile

diff --cc Makefile
Simple merge

diff --cc Makefile.config.example
index bda66ea,8e2c4fb..1dd6a8f
--- 1/Makefile.config.example
--- 2/Makefile.config.example
+++ b/Makefile.config.example
@@@ -8,15 -8,13 +8,18 @@@
  # CPU_ONLY := 1
  
  # uncomment to disable IO dependencies and corresponding data layers
 +# USE_OPENCV := 0
  # USE_LEVELDB := 0
  # USE_LMDB := 0
 -# USE_OPENCV := 0
 +
 +# uncomment to allow MDB_NOLOCK when reading LMDB files (only if necessary)
 +#     You should not set this flag if you will be reading LMDBs with any
 +#     possibility of simultaneous read and write
 +# ALLOW_LMDB_NOLOCK := 1
  
+ # Uncomment if you're using OpenCV 3
+ # OPENCV_VERSION := 3
+ 
  # To customize your choice of compiler, uncomment and set the following.
  # N.B. the default for Linux is g++ and the default for OSX is clang++
  # CUSTOM_CXX := g++