nginx: disallow AIO support on AArch64

The nginx AIO support cannot build on AArch64, because it hardcodes
the usage of SYS_eventfd(), while it should just use eventfd() from
the C library.

See https://bugs.launchpad.net/linaro-aarch64/+bug/1160013 for details.

Fixes:

  http://autobuild.buildroot.org/results/54b/54bb761f9e774d91066b78217efcd583fdd85ff3/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nginx/Config.in

@@ -16,6 +16,10 @@ if BR2_PACKAGE_NGINX
 
 config BR2_PACKAGE_NGINX_FILE_AIO
 	bool "file AIO support"
+	# Does not build, because nginx hardcodes using SYS_eventfd,
+	# but it's not available on AArch64, only eventfd() is.
+	# See https://bugs.launchpad.net/linaro-aarch64/+bug/1160013
+	depends on !BR2_aarch64
 
 config BR2_PACKAGE_NGINX_HTTP
 	bool "http server"