cmake HAVE_IMGCODEC_PXM examples

SsageParuders/Android_Native_Surface my_android_opencv/modules/imgcodecs/CMakeLists.txt :89

add_definitions(-DHAVE_IMGCODEC_PXM)

joachimBurket/esp32-opencv modules/imgcodecs/CMakeLists.txt :75

add_definitions(-DHAVE_IMGCODEC_PXM)