Update Zig (#164)

* update zig

* pkg/fontconfig: clean up @as

* pkg/freetype,harfbuzz: clean up @as

* pkg/imgui: clean up @as

* pkg/macos: clean up @as

* pkg/pixman,utf8proc: clean up @as

* clean up @as

* lots more @as cleanup

* undo flatpak changes

* clean up @as

pkg/utf8proc/main.zig

@@ -4,15 +4,15 @@ pub const c = @import("c.zig");
 /// except that a width of 0 is returned for non-printable codepoints
 /// instead of -1 as in `wcwidth`.
 pub fn charwidth(codepoint: u21) u8 {
-    return @intCast(u8, c.utf8proc_charwidth(@intCast(i32, codepoint)));
+    return @intCast(c.utf8proc_charwidth(@intCast(codepoint)));
 }
 
 /// Given a pair of consecutive codepoints, return whether a grapheme break is
 /// permitted between them (as defined by the extended grapheme clusters in UAX#29).
 pub fn graphemeBreakStateful(cp1: u21, cp2: u21, state: *i32) bool {
     return c.utf8proc_grapheme_break_stateful(
-        @intCast(i32, cp1),
-        @intCast(i32, cp2),
+        @intCast(cp1),
+        @intCast(cp2),
         state,
     );
 }