开发板的交叉编译链arm-linux-gnueabihf-

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把交叉编译工具替换/usr/bin/下面的编译工具：

root@am437x-evm:~# ls /usr/bin/arm-*
/usr/bin/arm-linux-gnueabihf-addr2line
/usr/bin/arm-linux-gnueabihf-ar
/usr/bin/arm-linux-gnueabihf-as
/usr/bin/arm-linux-gnueabihf-c++filt
/usr/bin/arm-linux-gnueabihf-cpp
/usr/bin/arm-linux-gnueabihf-elfedit
/usr/bin/arm-linux-gnueabihf-g++
/usr/bin/arm-linux-gnueabihf-gcc
/usr/bin/arm-linux-gnueabihf-gcc-ar
/usr/bin/arm-linux-gnueabihf-gcc-nm
/usr/bin/arm-linux-gnueabihf-gcc-ranlib
/usr/bin/arm-linux-gnueabihf-gprof
/usr/bin/arm-linux-gnueabihf-ld
/usr/bin/arm-linux-gnueabihf-ld.bfd
/usr/bin/arm-linux-gnueabihf-nm
/usr/bin/arm-linux-gnueabihf-objcopy
/usr/bin/arm-linux-gnueabihf-objdump
/usr/bin/arm-linux-gnueabihf-ranlib
/usr/bin/arm-linux-gnueabihf-readelf
/usr/bin/arm-linux-gnueabihf-size
/usr/bin/arm-linux-gnueabihf-strings
/usr/bin/arm-linux-gnueabihf-strip
/usr/bin/arm-unknown-linux-gnueabi-pkg-config