Forward std_options from entrypoint in main.zig

src/main.zig

@@ -1,3 +1,4 @@
+const std = @import("std");
 const build_config = @import("build_config.zig");
 
 /// See build_config.ExeEntrypoint for why we do this.
@@ -16,6 +17,12 @@ const entrypoint = switch (build_config.exe_entrypoint) {
 /// The main entrypoint for the program.
 pub const main = entrypoint.main;
 
+/// Standard options such as logger overrides.
+pub const std_options: std.Options = if (@hasDecl(entrypoint, "std_options"))
+    entrypoint.std_options
+else
+    .{};
+
 test {
     _ = entrypoint;
 }