Add minor improvements and cleanup

libc/testlib/showerror.c

@@ -20,6 +20,7 @@
 #include "libc/calls/internal.h"
 #include "libc/errno.h"
 #include "libc/fmt/fmt.h"
+#include "libc/log/color.h"
 #include "libc/log/internal.h"
 #include "libc/log/log.h"
 #include "libc/math.h"

libc/testlib/showerror_.c

@@ -21,6 +21,7 @@
 #include "libc/calls/internal.h"
 #include "libc/errno.h"
 #include "libc/fmt/fmt.h"
+#include "libc/log/color.h"
 #include "libc/log/internal.h"
 #include "libc/log/log.h"
 #include "libc/math.h"