curl: update curl to version 7.43.0

curl: update curl to version 7.43.0

This brings curl to version 7.43.0 and contains fixes for the following
security vulnerabilities:

CVE-2015-3236: lingering HTTP credentials in connection re-use
http://curl.haxx.se/docs/adv_20150617A.html

CVE-2015-3237: SMB send off unrelated memory contents
http://curl.haxx.se/docs/adv_20150617B.html

The 100-check_long_long patch is not needed any more, because the
upstream autoconf script already checks for long long when cyassl is
selected.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46169 3c298f89-4303-0410-b956-a3cf2f4a3e73