Revert "all: fix 3 more tests"

This reverts commit 4d61443.

Author: medvednikov

vlib/builtin/chan_option_result.v

@@ -59,9 +59,6 @@ pub fn (err IError) str() string {
 	if err is None__ {
 		return 'none'
 	}
-	if err.code() > 0 {
-		return '${err.msg()}; code: ${err.code()}'
-	}
 	return err.msg()
 }
 

vlib/v/gen/c/cgen.v

@@ -4403,7 +4403,7 @@ fn (mut g Gen) typeof_expr(node ast.TypeOf) {
 	if sym.kind == .sum_type {
 		// When encountering a .sum_type, typeof() should be done at runtime,
 		// because the subtype of the expression may change:
-		g.write('charptr__vstring_literal(v_typeof_sumtype_${sym.cname}( (')
+		g.write('builtin__charptr_vstring_literal(v_typeof_sumtype_${sym.cname}( (')
 		if typ.nr_muls() > 0 {
 			g.write('*'.repeat(typ.nr_muls()))
 		}

vlib/v/gen/c/fn.v

@@ -1692,7 +1692,7 @@ fn (mut g Gen) method_call(node ast.CallExpr) {
 		match node.kind {
 			.type_name {
 				if left_sym.kind in [.sum_type, .interface] {
-					g.conversion_function_call('charptr__vstring_literal(v_typeof_${prefix_name}_${typ_sym.cname}',
+					g.conversion_function_call('builtin__charptr_vstring_literal(v_typeof_${prefix_name}_${typ_sym.cname}',
 						')', node)
 					return
 				}

vlib/v/pref/default.v

@@ -242,9 +242,9 @@ fn (mut p Preferences) find_cc_if_cross_compiling() {
 		return
 	}
 	if p.ccompiler_set_by_flag {
-		// tcc cannot cross-compile for Windows (no Windows headers),
-		// so override it with the proper cross-compiler.
-		if p.os == .windows && p.ccompiler.contains('tcc') {
+		// Only mingw compilers can cross-compile for Windows (others lack Windows headers),
+		// so override any non-mingw compiler with the proper cross-compiler.
+		if p.os == .windows && !p.ccompiler.contains('mingw') {
 			p.ccompiler = p.vcross_compiler_name()
 			return
 		}