Fix Makefile to Support Spaces in Paths

[EthanDieterich]

Overview

In this branch, I fixed issues my team and I encountered with the Makefile, where it would not function correctly when spaces were present in the path. The issue was traced back to how PATH and SHELL were being set, leading to failures when running make in directories with spaces in their names.

What this PR does / why we need it

• This PR ensures that paths are properly quoted in the Makefile to prevent issues caused by spaces in directory names.
• Updates how SHELL passes the PATH variable to ensure compatibility with /bin/sh while keeping the correct environment settings.
• This fix is necessary for users working in directories with spaces (e.g., /home/user/My Project/), where make previously failed due to improper path handling.

Special notes for your reviewer