23.3.0-rc3

Considering that there has been 6 weeks since last stable release and 4 since there was any activity on 23.2 staging branch, I decided to do the MSVC builds of 23.3.0 release candidates as there is little hope left there will ever be a 23.2.2 release.

Feedback info

• Windows 7 / Server 2008 R2 support remained in place for the time being as this poll results were 56% in favor of keeping support at release time.
• Unit tests were removed from release package as this poll results were 42% in favor of providing them at release time.

Build script

• MSVC: Support building Mesa3D with MSYS2 flex and bison.
• MSVC build: Update DirectX headers to what is expected to be 1.611.1 stable;
• Misc/CMD syntax: Improve handling scenario where development root folder is a disk drive root;
• Misc/CMD syntax: Fix 2 spots where quoted path support is missing;
• MSYS2: Fix environment init when development root folder is a disk drive root.

Build environment updates

• MSVC