Autobuild does not work with arguments containing blanks

[yanghanlin]

autobuild.py does not work with args containing blanks; as it is passing the original arguments to the command line, those originally with blanks will be recognized by the shell as multiple args and therefore causing errors.

For example, when I wish to build executable named hello world from source file hello world.cpp:

$ autobuild.py --target 'hello world' 'hello world.cpp'
> g++ hello world.cpp -o hello world -g -Wall -static-libgcc -std=c++17
g++: error: hello: No such file or directory
g++: error: world.cpp: No such file or directory
g++: error: world: No such file or directory
g++: fatal error: no input files
compilation terminated.

Consider to introduce quotes when appropriate or to replace os.system with subprocess.run to fix this issue.