Add support for multiple libraries to extract PTX files

[RedCarrottt]

In order to resolve Issue #112, I modified GPGPU-Sim so that it extracts PTX files from multiple libraries.

Existing GPGPU-Sim cannot run both convolution layer and FC layer since each layer requires libcudnn or libcublas. Therefore, in Issue #112, it results in PTX not implementation error when simulating libcublas call.

After applying this patch, mnistCUDNN in https://github.com/gpgpu-sim/gpgpu-sim_simulations works well with Titan V config(Volta architecture).

You can the path of multiple libraries as following:
(each library path is separated by colons(:).)

export PYTORCH_BIN=/usr/local/cuda/lib64/libcudnn.so:/usr/local/cuda/lib64/libcublas.so