nginx-upload: bump version to fix build against nginx-1.12.x

Fixes:
http://autobuild.buildroot.net/results/9ec/9ecf714667736bf61f643ad55588d3d6ebdde603/
http://autobuild.buildroot.net/results/cea/cea64e30e98543e10c8819f6337babfec6d7ac0f/

Bump to the latest commit on the 2.255 branch, which contains pull request
88 (work with latest nginx versions):

https://github.com/vkholodkov/nginx-upload-module/pull/88

git shortlog aba1e3f34c754551f4f49e572bc86863d535609d..
Anton (1):
      Add files via upload

Valery Kholodkov (5):
      Added tag for version 2.0.8
      Recreated tag for version 2.0.8
      Backported to nginx 0.5.37 by Anthony Kholodkov
      Updated Changelog
      Merge pull request #88 from antonbarinov/2.255

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nginx-upload/nginx-upload.hash

@@ -1,2 +1,2 @@
 #Locally Computed:
-sha256 8cd1d9d968ffba807de2e546ea9cad5e1ae294ec60b4927b2d60a98bdb4a1144  nginx-upload-aba1e3f34c754551f4f49e572bc86863d535609d.tar.gz
+sha256 5f1c3c2b9858b9cacd877a0f2df9b9263734e9cef8d837b73f0e659c0f7fde2d  nginx-upload-70bee48f1811eecd255ed094ce9f0fb560c390c3.tar.gz

package/nginx-upload/nginx-upload.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-NGINX_UPLOAD_VERSION = aba1e3f34c754551f4f49e572bc86863d535609d
+NGINX_UPLOAD_VERSION = 70bee48f1811eecd255ed094ce9f0fb560c390c3
 NGINX_UPLOAD_SITE = $(call github,vkholodkov,nginx-upload-module,$(NGINX_UPLOAD_VERSION))
 NGINX_UPLOAD_LICENSE = BSD-3-Clause
 NGINX_UPLOAD_LICENSE_FILES = LICENCE