Closes#6702
This removes our mach-glfw dependency and replaces it with an in-tree
pkg/glfw that includes both the source for compiling glfw as well as the
Zig bindings. This matches the pattern from our other packages.
This is based on the upstream mach-glfw work and therefore includes the
original license and copyright information.
The reasoning is stated in the issue but to summarize for the commit:
- mach-glfw is no longer maintained, so we have to take ownership
- mach-glfw depended on some large blobs of header files to enable
cross-compilation but this isn't something we actually care about,
so we can (and do) drop the blobs
- mach-glfw blobs were hosted on mach hosts. given mach-glfw is
unmaintained, we can't rely on this hosting
- mach-glfw relied on a "glfw" package which was owned by another
person to be Zig 0.14 compatible, but we no longer need to rely on
this
- mach-glfw builds were outdated based on latest Zig practices
