* [TD-3913]<fix>: mips compile support.

* [TD-3913]<fix>: mips64 support.

* fix osSignal.c

* fix tcrc32c.c

* fix cmake.

* fix osInc.h

* fix gcc 4.8 compile error.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3913]<fix>: mips compile support.

* [TD-3912]<fix>: support mips64 compile.

add mips64 header file and modify tcrc32c.c for mips64.

* [TD-3913]<fix>: mips compile support.

verified on real loongson machine.

* fix cmake.

* fix gcc 4.8 compile error.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3913]<fix>: mips compile support.

* [TD-3912]<fix>: support mips64 compile.

add mips64 header file and modify tcrc32c.c for mips64.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

1. put the definitions of variables long_shifts and short_shifts and
function shift_crc() in #ifndef _TD_ARM_, because this function and
these variables are not used/called for arm64 build in travis. Hence
warnings come up as errors.
2. Added arm64 jobs into .travis.yml by adding -DCPUTYPE=aarch64 with
cmake command.
Signed-off-by: Nodidev <odidev@puresoftware.com>