Support TIC6X

Run:

export C6X_C_DIR=/opt/ccstudio/ccs/tools/compiler/ti-cgt-c6000_8.3.12/include;\
/opt/ccstudio/ccs/tools/compiler/ti-cgt-c6000_8.3.12/lib
export PATH=PATH:/opt/ccstudio/ccs/tools/compiler/ti-cgt-c6000_8.3.12/bin
./configure --disable-cli --enable-static --disable-bashcompletion \
--disable-opencl --disable-thread --disable-interlaced --bit-depth=8 \
--chroma-format=420 --disable-asm --enable-debug --disable-avs \
--disable-swscale --disable-lavf --disable-ffms --disable-gpac \
--disable-lsmash --host=tic6x-ti-none
make -j$(nproc) example

Refer:

- TMS320C6000 Assembly Language Tools: https://www.ti.com/lit/ug/sprui03e/sprui03e.pdf
- TMS320C6000 Optimizing C/C++ Compile: https://www.ti.com/lit/ug/sprui04e/sprui04e.pdf