runtime/cgo: use pthread_getattr_np on Android

It is defined in bionic libc since at least API level 3. Use it.

Updates #68285.

Change-Id: I215c2d61d5612e7c0298b2cb69875690f8fbea66
Reviewed-on: https://go-review.googlesource.com/c/go/+/626275
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Run-TryBot: Cherry Mui <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: cherrymui

src/runtime/cgo/gcc_stack_unix.c

@@ -21,7 +21,7 @@ x_cgo_getstackbound(uintptr bounds[2])
 	// Needed before pthread_getattr_np, too, since before glibc 2.32
 	// it did not call pthread_attr_init in all cases (see #65625).
 	pthread_attr_init(&attr);
-#if defined(__GLIBC__) || (defined(__sun) && !defined(__illumos__))
+#if defined(__GLIBC__) || defined(__BIONIC__) || (defined(__sun) && !defined(__illumos__))
 	// pthread_getattr_np is a GNU extension supported in glibc.
 	// Solaris is not glibc but does support pthread_getattr_np
 	// (and the fallback doesn't work...). Illumos does not.