tests: delete redundant cases

These were originally supposed to be incremental test cases but have
long since been made redundant.

test/cases/function_pointers.zig

@@ -1,30 +0,0 @@
-const std = @import("std");
-
-const PrintFn = *const fn () void;
-
-pub fn main() void {
-    var printFn: PrintFn = stopSayingThat;
-    var i: u32 = 0;
-    while (i < 4) : (i += 1) printFn();
-
-    printFn = moveEveryZig;
-    printFn();
-}
-
-fn stopSayingThat() void {
-    _ = std.posix.write(1, "Hello, my name is Inigo Montoya; you killed my father, prepare to die.\n") catch {};
-}
-
-fn moveEveryZig() void {
-    _ = std.posix.write(1, "All your codebase are belong to us\n") catch {};
-}
-
-// run
-// target=x86_64-macos
-//
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// Hello, my name is Inigo Montoya; you killed my father, prepare to die.
-// All your codebase are belong to us
-//

test/cases/print_u32s.zig

@@ -1,28 +0,0 @@
-const std = @import("std");
-
-pub fn main() void {
-    printNumberHex(0x00000000);
-    printNumberHex(0xaaaaaaaa);
-    printNumberHex(0xdeadbeef);
-    printNumberHex(0x31415926);
-}
-
-fn printNumberHex(x: u32) void {
-    const digit_chars = "0123456789abcdef";
-    var i: u5 = 28;
-    while (true) : (i -= 4) {
-        const digit = (x >> i) & 0xf;
-        _ = std.posix.write(1, &.{digit_chars[digit]}) catch {};
-        if (i == 0) break;
-    }
-    _ = std.posix.write(1, "\n") catch {};
-}
-
-// run
-// target=x86_64-macos
-//
-// 00000000
-// aaaaaaaa
-// deadbeef
-// 31415926
-//