glfw: support building with latest Zig master

This removes a linker hack which was preventing building with the latest
Zig master version. Of particular note, anyone wishing to use this library
will need to ensure they are up to date with latest master.

The binary releases available at https://ziglang.org/download/ (1783+eec825c and
beyond) are sufficient (really, anything released after today.)

Fixes hexops/mach#103

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

glfw/build.zig

@@ -218,18 +218,10 @@ fn linkGLFWDependencies(b: *Builder, step: *std.build.LibExeObjStep, options: Op
             }
             step.linkSystemLibrary("objc");
             step.linkFramework("AppKit");
-
-            // TODO(system_sdk): update MacOS system SDK so we can remove this, see:
-            // https://github.com/hexops/mach/pull/63#issuecomment-962141088
-            switch (@import("builtin").target.os.tag) {
-                .macos => {},
-                else => {
             step.linkFramework("CoreServices");
             step.linkFramework("CoreGraphics");
             step.linkFramework("Foundation");
         },
-            }
-        },
         else => {
             // Assume Linux-like
             switch (options.linux_window_manager) {