记录交叉编译 编译链未指定完整链接导致动态库链接失败

交叉编译需要指定完整路径的编译链，如：
./configure
--host=arm-linux-gnueabihf
--prefix=$(pwd)/_mini
--enable-shared
--disable-video
--disable-pjsua2
--disable-sound
--disable-ssl
--disable-ffmpeg
--disable-v4l2
--disable-libwebrtc
CFLAGS="-Os -DNDEBUG"
LDFLAGS="-s"
CC=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc
CXX=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++
AR=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-ar
RANLIB=/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-ranlib