Add conditional code for android's lack of definition of SYS_getdent64.
Fixes issue20307. No Misc/NEWS entry because frankly this is an
esoteric platform for anyone to be figuring out how to cross compile
CPython for.
diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index a2d7022..648a569 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -18,6 +18,12 @@
#include <dirent.h>
#endif
+#if defined(__ANDROID__) && !defined(SYS_getdents64)
+/* Android doesn't expose syscalls, add the definition manually. */
+# include <sys/linux-syscalls.h>
+# define SYS_getdents64 __NR_getdents64
+#endif
+
#if defined(sun)
/* readdir64 is used to work around Solaris 9 bug 6395699. */
# define readdir readdir64