Add an interface to set the number of threads for math function, and set the default value to 1 for inference.

* compile and install the static library of fluid inference

* fix dynload_cuda not in CPU mode

* update shared library and adjust the deploy of openblas

* adjust the deploy of openblas

* * auto add all fluid modules for static library
* use libprotobuf.a instead of libprotobuf-lite.a for profiler

* use set_property to set the global varible instead of ENV

* add gpu depends of fluid modules, auto add inference_lib_dist depends

* change the condition of openblas_lib, and fix a typo

* Support the build for multiple architectures at one cmake command (iOS).

* Update the documentations.

executing `make install` and WITH_C_API is set.

Recover the mistakenly deleted WARPCTC variable in cmake.