Deprecated issue while building using catkin_make

[sachinkmohan]

`/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp: In member function ‘int usb_cam::UsbCam::init_mjpeg_decoder(int, int)’:

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:386:89: warning: ‘int avpicture_alloc(AVPicture*, AVPixelFormat, int, int)’ is deprecated [-Wdeprecated-declarations]
avpicture_alloc((AVPicture *)avframe_rgb_, AV_PIX_FMT_RGB24, image_width, image_height);
^
In file included from /home/robo/catkin_ws/src/usb_cam/include/usb_cam/usb_cam.h:44:0,
from /home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:55:

/usr/include/x86_64-linux-gnu/libavcodec/avcodec.h:5626:5: note: declared here
int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
^~~~~~~~~~~~~~~

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:397:90: warning: ‘int avpicture_get_size(AVPixelFormat, int, int)’ is deprecated [-Wdeprecated-declarations]
avframe_camera_size_ = avpicture_get_size(AV_PIX_FMT_YUV422P, image_width, image_height);
^
In file included from /home/robo/catkin_ws/src/usb_cam/include/usb_cam/usb_cam.h:44:0,
from /home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:55:

/usr/include/x86_64-linux-gnu/libavcodec/avcodec.h:5653:5: note: declared here
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
^~~~~~~~~~~~~~~~~~

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:398:85: warning: ‘int avpicture_get_size(AVPixelFormat, int, int)’ is deprecated [-Wdeprecated-declarations]
avframe_rgb_size_ = avpicture_get_size(AV_PIX_FMT_RGB24, image_width, image_height);
^
In file included from /home/robo/catkin_ws/src/usb_cam/include/usb_cam/usb_cam.h:44:0,
from /home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:55:

/usr/include/x86_64-linux-gnu/libavcodec/avcodec.h:5653:5: note: declared here
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
^~~~~~~~~~~~~~~~~~

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp: In member function ‘void usb_cam::UsbCam::mjpeg2rgb(char*, int, char*, int)’:

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:422:94: warning: ‘int avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, const AVPacket*)’ is deprecated [-Wdeprecated-declarations]
decoded_len = avcodec_decode_video2(avcodec_context_, avframe_camera_, &got_picture, &avpkt);
^
In file included from /home/robo/catkin_ws/src/usb_cam/include/usb_cam/usb_cam.h:44:0,
from /home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:55:

/usr/include/x86_64-linux-gnu/libavcodec/avcodec.h:4993:5: note: declared here
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
^~~~~~~~~~~~~~~~~~~~~

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:441:76: warning: ‘int avpicture_get_size(AVPixelFormat, int, int)’ is deprecated [-Wdeprecated-declarations]
int pic_size = avpicture_get_size(avcodec_context_->pix_fmt, xsize, ysize);
^
In file included from /home/robo/catkin_ws/src/usb_cam/include/usb_cam/usb_cam.h:44:0,
from /home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:55:

/usr/include/x86_64-linux-gnu/libavcodec/avcodec.h:5653:5: note: declared here
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
^~~~~~~~~~~~~~~~~~

/home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:454:123: warning: ‘int avpicture_layout(const AVPicture*, AVPixelFormat, int, int, unsigned char*, int)’ is deprecated [-Wdeprecated-declarations]
int size = avpicture_layout((AVPicture *)avframe_rgb_, AV_PIX_FMT_RGB24, xsize, ysize, (uint8_t *)RGB, avframe_rgb_size_);
^
In file included from /home/robo/catkin_ws/src/usb_cam/include/usb_cam/usb_cam.h:44:0,
from /home/robo/catkin_ws/src/usb_cam/src/usb_cam.cpp:55:

/usr/include/x86_64-linux-gnu/libavcodec/avcodec.h:5645:5: note: declared here`