platform.h: define endgrent() and endpwent() as no-ops on Android

Surprisingly, bionic libc seems to lack these functions.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/platform.h

@@ -334,6 +334,11 @@ typedef unsigned smalluint;
 # define MAXSYMLINKS SYMLOOP_MAX
 #endif
 
+#if defined(ANDROID) || defined(__ANDROID__)
+# define endpwent() ((void)0)
+# define endgrent() ((void)0)
+#endif
+
 
 /* ---- Who misses what? ------------------------------------ */