Some _SC* macros are not available from the Cosmopolitan libc

This patch is probably the more invasive about Esperanto/Cosmopolitan. It adds
a new compilation path when [__ESPERANTO__] is defined. A note was added to
explain where it comes from: the cross-compiler [arch-esperanto-none-static-cc]
systematically defines [-D__ESPERANTO__] in order to let third-party libraries
(such as lwt) to choose different compilation paths. And here we are!

Cosmopolitan does not defines required [_SC*] constants and
[unix_get_pw_gr_nam_id_job] can not be compiled. We discard this piece of code
when we want to compile with Cosmopolitan as it's the case for Android too.

Author: dinosaure

src/unix/unix_c/unix_get_pw_gr_nam_id_job.c

@@ -20,7 +20,11 @@
 
 #include "lwt_unix.h"
 
-#if !defined(__ANDROID__)
+/* NOTE: [__ESPERANTO__] is defined by the cross-compiler if we compile into
+ * the [esperanto] context (with [arch-esperanto-none-static-cc]). Otherwise,
+ * nobody should define this macro. The code above can not be compiled with
+ * Esperanto/Cosmopolitan due to missing [_SC*] macros. */
+#if !defined(__ANDROID__) && !defined(__ESPERANTO__)
 
 static value alloc_passwd_entry(struct passwd *entry)
 {