std.leb128: Disable two tests on x86-linux-musl with dynamic linkage.

#23922

Author: alexrp

lib/std/leb128.zig

@@ -1,3 +1,4 @@
+const builtin = @import("builtin");
 const std = @import("std");
 const testing = std.testing;
 
@@ -432,6 +433,8 @@ fn test_write_leb128(value: anytype) !void {
 }
 
 test "serialize unsigned LEB128" {
+    if (builtin.cpu.arch == .x86 and builtin.abi == .musl and builtin.link_mode == .dynamic) return error.SkipZigTest;
+
     const max_bits = 18;
 
     comptime var t = 0;
@@ -446,6 +449,8 @@ test "serialize unsigned LEB128" {
 }
 
 test "serialize signed LEB128" {
+    if (builtin.cpu.arch == .x86 and builtin.abi == .musl and builtin.link_mode == .dynamic) return error.SkipZigTest;
+
     // explicitly test i0 because starting `t` at 0
     // will break the while loop
     try test_write_leb128(@as(i0, 0));