test/standalone/emit_asm_and_bin and issue_12588 can be re-enabled now

[andrewrk]

zig/test/standalone.zig

Lines 143 to 152 in 5722261

	// TODO take away EmitOption.emit_to option and make it give a FileSource
	//.{
	// .build_root = "test/standalone/emit_asm_and_bin",
	// .import = @import("standalone/emit_asm_and_bin/build.zig"),
	//},
	// TODO take away EmitOption.emit_to option and make it give a FileSource
	//.{
	// .build_root = "test/standalone/issue_12588",
	// .import = @import("standalone/issue_12588/build.zig"),
	//},

These were waiting for a LazyPath reckoning, which has happened in #16446 thanks to @MasterQ32. Now these tests can be enabled.

The one called "issue_12588" should be renamed to describe what it is testing instead of named after a GitHub:tm: issue.