gnulib: stdint: fix build with Android's Bionic fox x86

* lib/stdint.in.h: fix check to test if included-fixed/sys/types.h
was already included as _SSIZE_T_DEFINED_ might also be defined
in include/machine/_types.h, which is included by stdio.h

Signed-off-by: Eric Blake <eblake@redhat.com>

Conflicts:
	ChangeLog

lib/stdint.in.h

@@ -40,7 +40,7 @@
    Ideally we should test __BIONIC__ here, but it is only defined after
    <sys/cdefs.h> has been included; hence test __ANDROID__ instead.  */
 #if defined __ANDROID__ \
-    && defined _SYS_TYPES_H_ && !defined _SSIZE_T_DEFINED_
+    && defined _SYS_TYPES_H_ && !defined __need_size_t
 # @INCLUDE_NEXT@ @NEXT_STDINT_H@
 #else