Build fails when there are spaces in the working path

[macsforme]

When attempting to build from a directory with a space in the working path (for example, your home directory if it has your first and last name), the build will fail after repeated statements of "The system cannot find the path specified."

It appears that putting some of the variables related to the output directory, etc. in quotes solves at least most of these errors. Parts of the script already have these variables in quotes. I got stuck on trying to fix the SDL portion, and I just moved the directory to a different path (which had no spaces in it), which made it work. However, I believe inserting quotes in the right areas will correct most if not all of the errors.

[macsforme]

#4 fixes most of the errors. I couldn't figure out how to fix the errors in SDL2.